Coral Care: Essential Practices for Healthy Reef Aquariums

Keeping corals healthy in a home reef aquarium requires a disciplined approach to water chemistry, lighting, nutrition, and observation. Corals are colonial animals that depend on a stable environment and a balanced relationship with the photosynthetic algae living inside their tissues. This article provides a practical framework for coral husbandry based on current research and established aquarium practice. It covers water parameters, lighting, feeding, common problems, and when to seek professional help. The guidance is written for animal owners, veterinary students, veterinary technicians, and veterinary professionals who want a clear reference for daily management decisions.

Scope and Reader Context

This article addresses the day-to-day care of stony and soft corals in closed-system home aquariums. It does not cover open-ocean reef restoration, large public aquarium systems, or commercial coral farming at scale, although some principles overlap. The focus is on what an owner can observe, measure, and adjust in a typical home tank. Veterinary professionals will find this useful when advising clients who keep reef aquariums, because many coral health problems trace back to water quality, lighting, or nutrition instead of infectious disease.

The term "coral" covers a wide range of animals with different needs. Small-polyp stony corals such as Acropora species generally demand intense lighting and very stable water chemistry. Large-polyp stony corals such as Euphyllia species are more forgiving but still require good water quality. Soft corals such as Briareum and Sinularia tolerate a broader range of conditions and are often recommended for beginners. Matching the coral species to the aquarium system is the first management decision an owner makes, and it determines most of the subsequent care requirements.

At a Glance: Coral Care Decision Table

The table below summarizes the key care areas covered in this article and the management actions associated with each. Use it as a quick reference before reading the detailed sections.

Water Parameters for Coral Health

Water chemistry is the foundation of coral care. Corals build their skeletons from calcium carbonate, and they depend on a narrow range of chemical conditions to do so. The relationship between alkalinity, calcium, and magnesium is particularly important because these three parameters interact. Alkalinity is a measure of the water's capacity to buffer against pH changes and is directly related to the carbonate ions corals use for skeleton formation. Calcium is the other major building block. Magnesium helps maintain the balance between these two by preventing the precipitation of calcium carbonate in the water column, which would otherwise make calcium unavailable to the corals.

Temperature

Most reef corals come from tropical waters and thrive in a narrow temperature band. The exact range depends on the species and its origin. Corals from the Great Barrier Reef, for example, experience seasonal temperature cycles that influence their biology, including reproduction. Research on broadcast spawning in closed-system aquariums has shown that replicating seasonal temperature patterns, along with lunar and diel cycles, can induce corals to complete full reproductive cycles in captivity. This finding underscores the importance of temperature stability and seasonal variation for coral health beyond simple survival.

For a home aquarium, the practical target is a stable temperature within the range of 24 to 28 degrees Celsius, with minimal daily fluctuation. Rapid temperature changes stress corals and can trigger bleaching. The coral bleaching research community has emphasized the importance of reporting the temperature offset from the maximum monthly mean of the collection site in experimental studies, which highlights how sensitive corals are to temperature deviations from their natural baseline. In a home aquarium, the owner should know the natural temperature range of the species they keep and aim to stay within it.

Temperature management decisions include choosing a reliable heater with a thermostat, using a backup heater, and monitoring temperature daily. A digital thermometer with an alarm is a worthwhile investment. If the temperature drifts outside the target range, the owner should check the heater, the room temperature, and the aquarium lighting, which can add heat. Rapid temperature swings of more than 2 degrees Celsius within 24 hours warrant immediate investigation and correction.

Salinity

Salinity, measured as specific gravity or parts per thousand, affects the osmotic balance of corals and their symbiotic algae. Most reef aquariums target a specific gravity of 1.024 to 1.026, which corresponds to approximately 32 to 35 parts per thousand. The key management point is stability. Evaporation removes fresh water, concentrating salts, so the owner must replace evaporated water with fresh water, not saltwater. A refractometer or conductivity meter should be used for accurate measurement, and the reading should be logged at least weekly.

Salinity drift causes stress that may not be immediately visible. Corals may close their polyps, reduce mucus production, or lose color over time. If salinity drifts outside the target range, the owner should correct it gradually. A rapid correction can cause osmotic shock. The professional escalation criterion is a drift of more than 0.002 specific gravity units from the target that persists for more than a few days despite corrective action.

Alkalinity, Calcium, and Magnesium

Alkalinity, calcium, and magnesium are the three parameters that most directly affect coral skeleton growth. The ideal ranges depend on the coral species and the overall system. Many stony coral keepers target an alkalinity of 7 to 9 dKH, calcium of 380 to 450 parts per million, and magnesium of 1250 to 1350 parts per million. These ranges support calcification without causing precipitation problems.

The interaction between these parameters is critical. If alkalinity is too high relative to calcium, calcium carbonate can precipitate spontaneously, depleting calcium and potentially damaging coral tissue. If magnesium is too low, it becomes difficult to maintain both alkalinity and calcium in the desired ranges. Testing all three parameters together, instead of individually, gives a more complete picture of the water chemistry.

Testing frequency depends on the stability of the system. A newly established tank or a tank with many stony corals may require daily or every-other-day testing. A mature tank with few corals may only need weekly testing. The owner should log all results and look for trends. A gradual decline in alkalinity often indicates that coral growth is consuming carbonate, which is a positive sign but also a signal that dosing needs adjustment.

Dosing methods include two-part solutions, calcium reactors, and kalkwasser. Each method has tradeoffs. Two-part dosing is simple and precise but requires daily attention. Calcium reactors use carbon dioxide to dissolve calcium carbonate media and can maintain high demand but require more equipment and monitoring. Kalkwasser is inexpensive but can raise pH and is not suitable for very high demand systems. The owner should choose a method that matches their time commitment and the demand of their corals.

The professional escalation criterion for water chemistry is an alkalinity reading below 6 dKH or above 12 dKH that persists for more than 48 hours. These extremes can cause tissue damage and rapid coral loss. If the owner cannot stabilize the parameters with routine dosing, they should seek advice from a veterinarian or an experienced reef keeper.

pH

pH is a measure of the acidity or alkalinity of the water and is closely tied to alkalinity and carbon dioxide levels. Most reef aquariums operate best with a pH between 8.0 and 8.4. pH tends to drop at night when corals and algae respire and produce carbon dioxide, and it rises during the day when photosynthesis consumes carbon dioxide. A small daily swing is normal, but a persistently low pH can reduce calcification and stress corals.

Management of pH involves maintaining adequate alkalinity, ensuring good gas exchange at the water surface, and avoiding excessive carbon dioxide buildup in the room. Protein skimmers and surface agitation help with gas exchange. If pH is persistently low, the owner should check room ventilation and consider whether the alkalinity target is appropriate. pH should be measured with a reliable probe or test kit, and readings should be logged alongside alkalinity and temperature.

Lighting for Coral Photosynthesis and Growth

Lighting is the energy source for the symbiotic algae, known as Symbiodiniaceae, that live inside coral tissues. These algae perform photosynthesis and transfer a large portion of the resulting sugars to the coral host. This relationship provides most of the energy requirements for many coral species, particularly those that are primarily autotrophic. The intensity, spectrum, and photoperiod of aquarium lighting all affect coral health, growth, and color.

Light Intensity and Spectrum

Different coral species have different light requirements based on their natural depth and habitat. Corals from shallow, clear water, such as many Acropora species, require high light intensity. Corals from deeper or turbid water, such as many fungiids and some soft corals, thrive under lower light. Matching the light intensity to the species is one of the most important decisions in coral care.

Research on the effects of blue light on coral physiology has shown species-specific responses. In one study, Stylophora pistillata exhibited the highest growth under high-light and high-feeding conditions, while Pocillopora damicornis showed no significant growth differences among treatments. Both species displayed reduced color scores under high-light conditions. This finding demonstrates that more light is not always better and that the optimal intensity depends on the species.

The spectrum of light also matters. Corals and their symbiotic algae use primarily the blue and violet portions of the spectrum for photosynthesis. Many aquarium lights are designed to emit a high proportion of blue light, which supports photosynthesis and can enhance the fluorescence of coral pigments. However, the same research noted that high blue light can reduce the photosynthetic capacity of the symbiotic algae while increasing calcification and pigment production. The owner should choose a light with adjustable intensity and spectrum to match the needs of their corals.

Photoperiod and Acclimation

The photoperiod, or the number of hours the light is on each day, should mimic natural conditions. Most reef aquariums run lights for 8 to 12 hours per day, often with a gradual ramp up and down to simulate dawn and dusk. A sudden transition from darkness to full light can stress corals. A ramp period of 30 to 60 minutes on each end of the photoperiod is a practical management choice.

When introducing new corals to an aquarium or changing the lighting system, acclimation is essential. Corals that have been kept under lower light need time to adjust to higher intensity. A common approach is to start new corals in a shaded area of the tank and gradually move them to their final position over several weeks. Alternatively, the owner can reduce the light intensity or photoperiod and slowly increase it. The observation criterion is coral color and polyp extension. Tissue paling or bleaching within 7 days of a lighting change indicates that the light is too intense or the acclimation was too rapid.

Light and Coral Color

Coral color is influenced by both the symbiotic algae and the coral's own pigments. Under high light, corals may produce more protective pigments, which can change their appearance. Under low light, corals may appear brown because the symbiotic algae increase in density to capture more light. The owner should understand that color changes are a normal response to light conditions and not always a sign of poor health. However, a sudden loss of color, particularly if accompanied by tissue loss, is a cause for concern.

Nutrition and Feeding

Corals obtain energy from two sources: the photosynthetic products of their symbiotic algae and the capture of external food. The balance between these two sources varies by species. Some corals are primarily autotrophic, relying mostly on their algae, while others are more heterotrophic, deriving a significant portion of their energy from capturing zooplankton and other particles. Understanding the trophic strategy of each coral species is essential for designing a feeding program.

Trophic Strategies and Feeding Responses

Research on coral culture has demonstrated that incorporating fish into coral systems can provide an accessible source of nitrogen and phosphorus enrichment through the dissolved portion of fish waste. In one study, corals exposed to fish or fish-water generally showed increased protein and symbiont density within their tissues. The more autotrophic corals, Acropora kenti and Porites lutea, displayed improved growth in the fish treatments, while the more heterotrophic Pocillopora verrucosa grew fastest when supplied with live feeds. The slow-growing, heterotrophic Platygyra daedalea did not show significant improvements in growth under any treatment.

These findings have practical implications for home aquariums. A well-stocked fish population can provide natural nutrient enrichment for corals, but it also increases the biological load on the filtration system. The owner must balance the benefits of fish waste as coral nutrition against the risk of deteriorating water quality. Feeding corals directly with appropriate foods, such as live or frozen zooplankton, can support growth in heterotrophic species. The feeding response should be observed: corals that are hungry will extend their tentacles and capture food, while corals that are stressed or satiated may not respond.

Feeding Frequency and Amount

The frequency and amount of feeding depend on the coral species and the overall system. Small-polyp stony corals generally capture fine particulate matter and may benefit from daily feeding of small amounts of phytoplankton or coral-specific foods. Large-polyp stony corals can capture larger prey and may be fed several times per week. Soft corals vary in their feeding requirements.

The research on blue light and feeding found that feeding corals enriched brine shrimp twice a week supported high survival and photosynthetic efficiency in both Stylophora pistillata and Pocillopora damicornis. This suggests that a moderate feeding frequency of two to three times per week is sufficient for many species. Overfeeding can degrade water quality, so the owner should start with a conservative amount and increase only if the corals show a positive response and water parameters remain stable.

Nutrient Management

Coral nutrition is closely tied to nutrient management in the water column. Nitrogen and phosphorus are essential nutrients, but skewed ratios can cause problems. Research on coral disease has shown that nutrient stress caused by skewed seawater nitrogen-to-phosphorus stoichiometry promotes the onset of Black Band Disease. In a global analysis, over 88 percent of Black Band Disease outbreaks occurred in regions with skewed nitrogen-to-phosphorus ratios, compared with only 16 percent that were linked to prior heat stress.

For the home aquarist, this means that both nutrient excess and nutrient imbalance are risk factors for disease. Regular testing of nitrate and phosphate, and maintaining a balanced ratio, is part of coral care. The practical target for nitrate is often 1 to 10 parts per million, and for phosphate 0.03 to 0.1 parts per million, but the optimal range depends on the system and the corals kept. The owner should log nutrient readings and watch for trends. A sudden rise in nutrients may indicate overfeeding, inadequate filtration, or a dying organism in the tank.

Water Flow and Circulation

Water flow delivers nutrients and oxygen to corals, removes waste products, and prevents sediment from settling on coral tissue. The flow requirements vary by species. Corals from high-energy reef flats, such as many Acropora species, require strong, turbulent flow. Corals from sheltered lagoons, such as many soft corals, prefer gentler flow. Matching the flow to the species is important for both growth and tissue health.

Excessive flow can cause tissue abrasion, particularly in large-polyp stony corals with fleshy tissue. Inadequate flow allows sediment to accumulate, which can smother corals and promote the growth of undesirable algae. The owner should observe the movement of coral tissue and the accumulation of detritus on the substrate. Coral polyps should extend fully and sway gently in the current. If tissue is being torn or if sediment is accumulating, the flow should be adjusted.

Powerheads, wavemakers, and return pumps are the primary tools for creating flow. A varied flow pattern, with periods of stronger and weaker current, more closely mimics natural reef conditions than a constant, unidirectional flow. The owner should position flow devices to create a chaotic, turbulent pattern instead of a single strong current. Regular cleaning of pumps and intakes prevents flow reduction from fouling.

Coral Health and Disease Recognition

Corals can develop a range of health problems, and early recognition is the key to successful intervention. The concept of a "Coral Hospital" has been proposed as a framework for diagnosing and treating sick corals, with the root cause of illness discerned before treatment. In a home aquarium, the owner plays the role of the diagnostician, observing changes in coral appearance and behavior and identifying the underlying cause.

Bleaching

Bleaching is the loss of symbiotic algae or their photosynthetic pigments, causing the coral to appear white or pale. It is a stress response to conditions such as elevated temperature, excessive light, poor water quality, or disease. Bleaching is the single largest global threat to coral reefs, and it is equally relevant in aquarium systems. The owner should distinguish between a gradual paling that may be a normal response to lighting changes and a rapid bleaching that indicates acute stress.

The research community has emphasized the importance of reporting experimental conditions, including temperature offsets from the maximum monthly mean of the collection site, to increase comparability among bleaching studies. For the home aquarist, this translates to knowing the natural temperature range of the corals kept and avoiding deviations from that range. If bleaching occurs, the owner should check temperature, salinity, alkalinity, and light intensity. The first response is to stabilize the environment, not to add treatments.

Tissue Necrosis and Sloughing

Tissue necrosis is the death of coral tissue, often appearing as white patches of exposed skeleton. It can be caused by physical damage, poor water quality, bacterial infection, or predation. Rapid tissue loss, where the tissue sloughs off within hours or days, is an emergency that requires immediate action. The owner should check water parameters, look for signs of predation or disease, and consider isolating the affected coral if possible.

The escalation criterion for tissue necrosis is rapid progression. If tissue loss is expanding within 48 hours, the owner should seek professional advice. A veterinarian with experience in aquatic animals can help identify the cause and recommend appropriate action. The owner should not attempt to treat with medications without a diagnosis, as inappropriate treatment can worsen the condition.

Ciliate Infections

Ciliate infections are a recognized disease of corals. Research in the Northern Coral Triangle reported the first record of ciliate infection on soft corals, where infected Briareum violacea underwent tissue ulceration and death within a short period. The ciliate, identified as Scuticociliatia sp., parasitized the coral endoderm and consumed coral tissue and zooxanthellae, leading to a significant reduction in zooxanthellae and chlorophyll a.

The study found that an extract of Combretum indicum, a tropical plant used medicinally to treat parasitic diseases, could treat the ciliates at concentrations of 1500 to 2500 parts per million via medicinal bath therapy without causing coral stress reactions. This finding is specific to the study conditions and should not be interpreted as a general recommendation for home aquarium use. The practical lesson is that ciliate infections exist, they can cause rapid tissue loss, and they require a diagnosis before treatment.

Microbial Imbalance and Dysbiosis

Corals host a complex community of microorganisms, including bacteria, that contribute to their health. The coral microbiome can be disrupted by stress, leading to dysbiosis, where beneficial bacteria decline and potential pathogens increase. Research on coral cryopreservation found that the natural wild microbiomes of Porites compressa were dominated by Endozoicomonadaceae at 76.5 percent relative abundance, but these beneficial symbionts were reduced to less than 6.9 percent in captivity and further reduced to less than 0.5 percent after isochoric vitrification. Vibrionaceae, which include potential pathogens, dominated communities post-thaw at 58.5 to 74.7 percent abundance.

This research highlights the sensitivity of the coral microbiome to environmental conditions and handling. For the home aquarist, it reinforces the importance of minimizing stress and maintaining stable conditions. The role of microorganisms in coral health, disease, and evolution is well established, and the owner should recognize that the invisible microbial community is as important as the visible coral tissue.

Quarantine and Biosecurity

Quarantine is the practice of isolating new corals before introducing them to the main aquarium. It is one of the most effective ways to prevent the introduction of pests, diseases, and unwanted organisms. A quarantine tank should be a separate system with its own filtration, lighting, and water. New corals should be observed in quarantine for a minimum of 2 to 4 weeks, during which time the owner can inspect them for signs of disease, parasites, or pests.

The quarantine period also allows the coral to acclimate to captive conditions and recover from the stress of collection and transport. The owner should observe the coral's polyp extension, color, and tissue condition during quarantine. Any signs of disease or stress should be addressed before the coral is moved to the main display tank.

Biosecurity extends beyond quarantine. Tools such as nets, siphons, and scrapers should be cleaned and disinfected between tanks. Water from one system should not be transferred to another without treatment. Hands should be washed before and after working in the aquarium. These practices reduce the risk of cross-contamination and protect the health of all the animals in the collection.

Common Failure Patterns in Coral Care

Understanding common failure patterns helps the owner recognize problems early and take corrective action. The following patterns are frequently observed in home reef aquariums.

The New Tank Syndrome

New tanks often experience a period of instability as the biological filtration establishes and water chemistry fluctuates. Corals added too early may suffer from ammonia or nitrite spikes, unstable alkalinity, or inadequate lighting. The owner should wait until the tank has cycled completely and water parameters are stable before adding corals. Adding a few hardy corals first and observing their response before adding more sensitive species is a prudent approach.

The Overstocking Pattern

Adding too many corals too quickly overwhelms the system's capacity to maintain stable water chemistry. Each coral consumes calcium and alkalinity and produces waste. A tank that was stable with a few corals may become unstable with many. The owner should add corals gradually and monitor water parameters closely after each addition. If alkalinity or calcium begins to decline, the dosing regimen must be adjusted before adding more corals.

The Lighting Mismatch

Corals that are placed under light that is too intense or too dim for their species will show signs of stress. Too much light causes paling or bleaching. Too little light causes brown coloration and reduced growth. The owner should research the light requirements of each species and place corals accordingly. Acclimation to new lighting conditions is essential.

The Nutrient Imbalance

Both nutrient excess and nutrient deficiency can cause problems. Excess nutrients promote the growth of undesirable algae, which can overgrow corals and compete for space and light. Nutrient deficiency, particularly of nitrogen and phosphorus, can limit coral growth and health. The owner should test nitrate and phosphate regularly and maintain a balanced ratio.

The Neglect Pattern

Corals require consistent attention. Skipping water changes, failing to test water parameters, or ignoring early signs of stress can lead to gradual decline and sudden loss. The owner should establish a routine for testing, water changes, and observation. A logbook or spreadsheet for recording water parameters and observations is an essential management tool.

Records and Measurements

Accurate records are the foundation of good coral care. The owner should maintain a log of water parameters, including temperature, salinity, pH, alkalinity, calcium, magnesium, nitrate, and phosphate. Each entry should include the date and time of the measurement. Trends are more informative than individual readings, so the owner should review the log regularly and look for patterns.

In addition to water parameters, the owner should record observations about coral health. This includes polyp extension, color, growth, and any signs of damage or disease. Photographs taken at regular intervals provide a visual record that can reveal subtle changes over time. A coral that is slowly losing color or tissue may not be obvious from day to day but becomes clear when comparing photos from weeks apart.

The following table provides a suggested record-keeping framework for coral care.

Welfare and Safety Context

Coral welfare is a legitimate consideration in aquarium management. Corals are living animals that can experience stress and respond to adverse conditions. The World Organisation for Animal Health includes animal health and welfare as a core part of its mission, and this extends to aquatic animals kept in captivity. The owner has a responsibility to provide conditions that meet the biological needs of the corals in their care.

The welfare of corals in home aquariums is closely tied to the stability of the environment. Corals cannot move away from adverse conditions, so the owner must anticipate and prevent problems instead of react to them. This includes providing appropriate water chemistry, lighting, nutrition, and flow, as well as protecting corals from physical damage and predation.

Safety is also a consideration. Aquarium equipment, including heaters, pumps, and lights, poses electrical and fire risks if not properly maintained. Water and electricity do not mix safely, so all electrical connections should be protected from splashes and drips. Heavy aquarium stands and tanks should be properly supported. The owner should follow manufacturer instructions for all equipment and inspect cords and connections regularly.

Professional Escalation Criteria

Knowing when to seek professional help is an important part of coral care. The following situations warrant consultation with a veterinarian or an experienced aquatic animal professional:

• Rapid tissue loss or sloughing that is expanding within 48 hours
• Bleaching that does not improve within 7 days after environmental conditions are stabilized
• Persistent water chemistry problems that cannot be corrected with routine dosing
• Signs of infectious disease, such as lesions, ulcers, or unusual growths
• Death of multiple corals within a short period
• Uncertainty about the cause of a coral health problem

A veterinarian with experience in aquatic animals can perform a diagnostic evaluation, which may include microscopy, microbial culture, or histopathology. The concept of the "Coral Hospital" emphasizes the importance of diagnosing the root cause of illness before treatment. In a home aquarium, the owner should provide the veterinarian with a complete history, including water parameters, observations, and photographs.

The owner should not attempt to treat corals with medications without a diagnosis. Inappropriate treatment can harm the coral, disrupt the aquarium ecosystem, and mask the underlying problem. The escalation criteria above are designed to guide the owner toward professional help before a problem becomes irreversible.

Frequently Asked Questions

How often should I test my aquarium water for coral health?

Testing frequency depends on the stability of the system and the sensitivity of the corals kept. A newly established tank or a tank with many stony corals may require daily testing of alkalinity and calcium. A mature tank with few corals may only need weekly testing. Temperature and salinity should be checked daily. The owner should log all results and look for trends, because a gradual change is often more informative than a single reading.

What is the ideal temperature range for a reef aquarium?

Most reef corals thrive in a stable temperature range of 24 to 28 degrees Celsius. The exact range depends on the species and its natural origin. The key management point is stability, because rapid temperature swings stress corals and can trigger bleaching. The owner should know the natural temperature range of the species they keep and aim to stay within it.

How do I know if my coral is getting too much light?

Signs of excessive light include tissue paling or bleaching, reduced polyp extension, and a washed-out appearance. These signs can appear within days of a lighting change or when a coral is moved to a brighter area of the tank. If these signs appear, the owner should reduce the light intensity or photoperiod and allow the coral to acclimate gradually.

What should I feed my corals?

The feeding program depends on the trophic strategy of the coral species. Autotrophic corals rely primarily on their symbiotic algae and may need little or no direct feeding. Heterotrophic corals benefit from regular feeding of appropriate foods, such as live or frozen zooplankton. A moderate feeding frequency of two to three times per week is sufficient for many species. The owner should observe the feeding response and adjust the amount accordingly.

Why is my coral turning brown?

Brown coloration in corals usually indicates an increase in the density of symbiotic algae, which is a response to lower light conditions. The coral is producing more algae to capture the available light. This is not necessarily a sign of poor health, but it may indicate that the light intensity is lower than the coral prefers. The owner can gradually increase the light intensity to encourage the coral to reduce its algae density and display its natural pigments.

What is coral bleaching and how do I respond to it?

Coral bleaching is the loss of symbiotic algae or their photosynthetic pigments, causing the coral to appear white or pale. It is a stress response to conditions such as elevated temperature, excessive light, poor water quality, or disease. The first response is to stabilize the environment by checking and correcting temperature, salinity, alkalinity, and light intensity. If bleaching does not improve within 7 days after conditions are stabilized, the owner should seek professional advice.

Can I keep different types of corals together in the same aquarium?

Yes, but the owner must match the corals to the system's capabilities. Different species have different requirements for light, flow, and water chemistry. Some corals also produce chemical compounds that can harm neighboring corals, and some corals can sting nearby corals with their tentacles. The owner should research the compatibility of the species they intend to keep and provide adequate spacing between corals.

When should I consult a veterinarian about my corals?

Consult a veterinarian if you observe rapid tissue loss that is expanding within 48 hours, bleaching that does not improve within 7 days after environmental conditions are stabilized, persistent

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References and Further Reading

• Merck Veterinary Manual. Merck Veterinary Manual.
• Animal Health and Welfare. World Organisation for Animal Health.
• The Coral Hospital.. Biopreservation and biobanking, 2019.
• Tank fouling community enhances coral microfragment growth.. PeerJ, 2023.
• Evaluating the coral microbiome during cryopreservation.. Cryobiology, 2024.
• Increasing comparability among coral bleaching experiments.. Ecological applications : a publication of the Ecological Society of America, 2021.
• Inducing broadcast coral spawning ex situ: Closed system mesocosm design and husbandry protocol.. Ecology and evolution, 2017.
• Improving Coral Grow-Out Through an Integrated Aquaculture Approach.. Aquaculture nutrition, 2025.
• Anemonefish, a model for Eco-Evo-Devo.. EvoDevo, 2020.
• Producing Coral Offspring with Cryopreserved Sperm: A Tool for Coral Reef Restoration.. Scientific reports, 2017.
• Laboratory Rearing of the Photosynthetic Sea Slug Elysia crispata (Gastropoda, Sacoglossa): Implications for the Study of Kleptoplasty and Species Conservation.. 2026.
• Breakdown of microbial networks links nutrient stress and reef coral disease.. 2026.
• Early life trade-offs in corals selected for adult heat tolerance are absent under heat stress. 2026.
• Effects of Blue Light and Feeding on the Physiological Performance of Reef Corals, &lt,i&gt,Stylophora pistillata&lt,/i&gt, and &lt,i&gt,Pocillopora damicornis&lt,/i&gt,.. 2026.
• Recurrent Alternate Parthenogenesis in the Common Smooth-Hound Shark (&lt,i&gt,Mustelus mustelus&lt,/i&gt,) with Additional Cases and Further Evidence for a Putative Adaptive Reproductive Strategy.. 2026.
• Northern coral triangle coral ciliates diseases and disease prevention: A first record.. Journal of Invertebrate Pathology, 2024.
• Strategy for Stony Coral Tissue Loss Disease Prevention and Response at Flower Garden Banks National Marine Sanctuary (Version 1). 2021.
• Lp(a) testing for the primary prevention of cardiovascular disease in high-income countries: a cost-effectiveness analysis.. Atherosclerosis, 2025.
• Coral Reef Aorta: A Rare Occlusive Disease of the Aorta Complicating Decision Making for Severe Aortic Stenosis Treatment.. Canadian Journal of Cardiology, 2019.
• The role of microorganisms in coral health, disease and evolution. Nature Reviews Microbiology, 2007.
• The Iconic Philippine Coral Reef at Steinhart Aquarium: The Husbandry, Welfare, Behavior, and Veterinary Care Considerations of a Large Multi-Taxa Living Coral Reef System. Journal of Zoological and Botanical Gardens, 2023.
• The CORALZOO project: A synopsis of four years of public aquarium science. Journal of the Marine Biological Association of the United Kingdom, 2012.

This article is educational and is not a substitute for veterinary diagnosis or treatment. Contact a veterinarian for advice about an individual animal.