InvertebrateMarineIntermediate
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Frogspawn coral
Fimbriaphyllia divisa
The Frogspawn Coral is a stunning LPS coral with sweeping, multi-tipped tentacles. It requires moderate, chaotic flow and must be kept away from other corals.
- Taxonomy
- Class:AnthozoaOrder:ScleractiniaFamily:EuphylliidaeGenus:FimbriaphylliaSpecies:Fimbriaphyllia divisaFormerly known as:Euphyllia divisa
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Water Temperature
24 - 28 °C
pH Value
8.1 - 8.4
Water type
Marine
Invertebrate type
LPS Coral
Adult size
20 cm
Minimum group
>= 1
Ecological role
Symbiont
Copper sensitivity
High
Species description
Geographical Origin and Habitat: The Frogspawn Coral (*Euphyllia divisa*) is an immensely popular, beautifully structured Large Polyp Stony (LPS) coral natively endemic to the warm, shallow reef crests, sheltered lagoons, and turbid coastal waters of the Indo-Pacific Ocean, Fiji, and the Great Barrier Reef. Their natural biotope is defined by environments with moderate, chaotic water flow and strong sunlight, where they form massive colonies that shelter numerous species of reef fish and invertebrates.
Taxonomy: Scientifically classified within the Euphylliidae family, they are an LPS coral characterized by a massive, calcified, arborescent (branching) or wall-like skeleton. Morphologically, they are globally recognized by the unique shape of their fleshy tentacles.
Defining Feature: Unlike the single-tipped Torch Coral, the tentacles of the Frogspawn branch out laterally, covered in multiple rounded, bulbous nodules that look exactly like a mass of translucent frog eggs.
Social Behavior: They are sessile but highly aggressive and territorially dominant invertebrates. Like all *Euphyllia* species, they fiercely defend their space.
CRITICAL BEHAVIOR: During the night (and occasionally during the day), the Frogspawn will extrude transparent, ultra-long "sweeper tentacles" capable of reaching up to 6 inches (15 cm) away. These sweepers are armed with extremely potent nematocysts that will instantly sting, burn, and dissolve the tissue of competing corals.
Coloration and Sexual Dimorphism: Sexual dimorphism is non-existent. Their coloration is vibrant, complex, and highly desirable in the reef aquarium. The thick, multi-branched tentacles are typically a translucent, fleshy pink, beige, or rich brown. The true visual spectacle lies in the bulbous "frog egg" nodules, which aggressively present in blinding neon green, electric pink, vivid purple, or glowing yellow. Under blue actinic lighting, the tips of the tentacles radiate intense fluorescence.
Care, breeding and tankmates
Tank Setup: The aquarium architecture MUST accommodate their highly aggressive nature and need for physical space. A minimum 110-liter (30-gallon) marine aquarium is strictly required.
CRITICAL REQUIREMENT: Provide absolute isolation. Leave a massive perimeter of empty space (at least 6 inches / 15 cm) around the coral to ensure its deadly sweeper tentacles cannot reach and assassinate neighboring corals. Securely glue the skeletal base to the live rock to prevent falls.
Diet and Feeding: They are robustly autotrophic, utilizing their symbiotic zooxanthellae to convert intense aquarium lighting into daily energy. However, they are also ferocious, highly capable predators. While target feeding is not strictly mandatory for survival, it is highly recommended. Gently target feeding the polyps 1-2 times a week with thawed Mysis shrimp, Krill, or LPS-specific sinking pellets will result in explosively fast skeletal growth and magnificent polyp extension.
Water Quality: As heavily calcified, demanding LPS corals, they require impeccable and highly stable water chemistry. They demand stable tropical heat (24-27°C / 75-81°F) and salinity between 1.024 and 1.026.
CRITICAL REQUIREMENT: They MUST be provided with pristine Calcium (420-450 ppm), Alkalinity (8-10 dKH), and Magnesium (1300-1400 ppm) levels to synthesize their heavy calcium carbonate skeletons. Rapid fluctuations in Alkalinity will cause the coral to eject its fleshy polyps (polyp bailout).
Compatibility and Tankmates: Compatibility requires careful, strategic mapping of the aquarium. They are deadly to SPS corals, most soft corals, and unrelated LPS corals.
Fascinating Exemption: Frogspawn Corals are generally completely immune to the stings of other Frogspawn Corals and Hammer Corals (*Euphyllia ancora*). Aquarists frequently place these species right next to each other to create a massive, multi-colored *Euphyllia* "garden" without any warfare. They are a beloved surrogate host for Clownfish.
Aquarium Breeding: Propagating (fragging) the Frogspawn Coral is simple but depends on its skeletal structure. If it has a "branching" skeleton, aquarists can easily use bone shears or a Dremel to cut off a dead, calcified branch well below the fleshy tissue.
CRITICAL WARNING: If the coral is a "wall" variant (a continuous, solid, meandering skeleton), fragging is highly dangerous and requires cutting through live fleshy tissue with a diamond bandsaw, which carries a massive risk of lethal infection.
Risks and Diseases:
CRITICAL DISEASE RISK: They are extremely vulnerable to "Brown Jelly Disease" (BJD), a fast-acting bacterial/ciliate pathogen that turns the coral's flesh into a rotting brown slime, capable of killing the coral in hours. The second risk is physical tissue tearing; placing the coral in water flow that is too strong or direct will violently thrash the fleshy polyps against the razor-sharp skeletal ridges, causing severe lacerations, subsequent bacterial infection, and death.
Geographic Origin and Distribution
The Frogspawn Coral (*Euphyllia divisa*) is an immensely popular, beautifully structured Large Polyp Stony (LPS) coral natively endemic to the warm, shallow reef crests, sheltered lagoons, and turbid coastal waters of the Indo-Pacific Ocean, Fiji, and the Great Barrier Reef. Their natural biotope is defined by environments with moderate, chaotic water flow and strong sunlight, where they form massive colonies that shelter numerous species of reef fish and invertebrates.
Origin
Cosmopolitan or introducedAustralia, New Guinea, and OceaniaTropical oceans and reefs
Invertebrate profile
- Diet
- Photosynthetic
- The diet of Fimbriaphyllia divisa must be carefully managed to ensure robust health, vibrant coloration, and long-term survival in captivity. In its natural environment, it has specific foraging habits that should be replicated as closely as possible in the aquarium. Supplementing its diet with high-quality, targeted commercial foods or fresh preparations ensures it receives necessary vitamins and minerals. Care should be taken not to overfeed, as uneaten food will quickly degrade water quality and harm the animal.
- Ecological role
- Symbiont
- Within its native ecosystem, Fimbriaphyllia divisa plays a vital biological role that contributes to the overall stability of the environment. Whether acting as a scavenger, filter feeder, predator, or prey, it helps to efficiently cycle nutrients through the food web. Its natural behaviors prevent the over-accumulation of organic waste or the unchecked growth of specific prey populations. Introducing this species to a home aquarium often replicates these beneficial ecological functions, promoting a cleaner and more balanced system.
- Adult size
- 20 cm
- This profile records an adult size of 20 cm. Use it to size the permanent habitat and choose compatible furnishings and cohabitants.
- Shock sensitivity
- High
- Aquarists must be aware that Fimbriaphyllia divisa is exceptionally sensitive to rapid fluctuations in its surrounding water parameters. Sudden shifts in temperature, specific gravity, pH, or dissolved organics can induce severe physiological shock, leading to rapid decline or death. A prolonged and careful drip acclimation process is highly recommended whenever moving this animal between systems. Maintaining pristine and unwavering water conditions is arguably the single most critical factor for its successful husbandry.
- Calcium and minerals
- High
- Proper mineral balance is crucial for Fimbriaphyllia divisa, as it requires consistent access to dissolved calcium and related trace elements for physiological maintenance. Depending on its specific biology, calcium is utilized for building external shells, hardening exoskeletons after molting, or supporting skeletal growth. In enclosed aquarium systems, these essential minerals can be rapidly depleted and may require regular supplementation. Routine water testing is encouraged to ensure that general hardness or specific calcium levels remain within the optimal range.
- Molting
- No
- For invertebrate species that undergo ecdysis, Fimbriaphyllia divisa requires a safe and stress-free environment to successfully shed its old exoskeleton. During and immediately following a molt, the animal's new shell is soft, leaving it extremely vulnerable to physical damage and predation. It is important to provide ample hiding spaces where it can retreat until its body fully hardens. If applicable, the discarded exoskeleton should be left in the tank, as the animal will often consume it to reclaim vital minerals.
- Reproduction
- Oviparous
- The reproductive strategies of Fimbriaphyllia divisa are varied and often highly adapted to its natural environmental conditions. Breeding efforts in a captive aquarium setting can range from straightforward to exceedingly difficult, often depending on specific larval requirements. Successful rearing of young frequently involves managing microscopic planktonic stages and specialized diets away from the main display tank. Nevertheless, captive propagation remains a rewarding endeavor that helps reduce the reliance on wild-caught specimens.
- Compatibility & tankmates
- Verify
- Careful consideration of tank mates is required to ensure the safety and wellbeing of Fimbriaphyllia divisa in a community setup. It should generally be housed with peaceful species that will not relentlessly harass it, nip at its appendages, or view it as a food source. Conversely, its own predatory or territorial instincts must be evaluated to ensure it does not harm smaller or slower-moving tank inhabitants. Observation during the initial introduction period is vital to confirm a harmonious balance within the aquarium.
Image gallery
Licensed images linked to the species or, when marked, to the closest representative taxon.
Related species
Recommendations grouped by close relatives, companion choices, and similar care.
