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Frogspawn Coral
Euphyllia divisa
Animalia›Cnidaria›Anthozoa›Euphylliidae
📍 Indo-Pacific Reef Systems
Frogspawn Coral is a popular LPS coral whose branching skeleton terminates in clusters of rounded, grape-like polyp tips that sway mesmerisingly in gentle water movement — resembling a mass of frog eggs. It is one of the three classic Euphyllia corals (alongside Hammer and Torch) and shares their care requirements. It has potent sweeper tentacles that can sting corals placed nearby, so adequate spacing within the reef aquarium is essential.
Tank Mates
Hardy reef fish that ignore corals and thrive in similar reef conditions
Beneficial for reef health; unlikely to damage coral tissue
Reef-safe scavengers that help maintain water quality
Small, peaceful fish that provide cleaning services without harming corals
Active but non-aggressive; stays in lower water column away from polyps
Both have sweeper tentacles; requires 6+ inches spacing to prevent sting damage
Common Diseases
Coral Bleaching
Loss of color, polyps appear white or pale, reduced feeding response
Reduce lighting intensity, check water parameters (especially temperature and alkalinity), ensure adequate flow, perform partial water changes to reduce nutrient imbalances
Brown Jelly Infection
Brown, gelatinous film spreading across coral tissue, rapid tissue recession
Isolate affected coral if possible, perform targeted water changes, remove affected tissue with clean tools, treat with iodine-based coral dips, improve water quality and reduce stressors
Polyp Recession
Polyps fail to extend, tissue pulls back from skeleton, reduced feeding
Check water parameters (calcium, alkalinity, pH), verify lighting and flow are adequate, reduce nearby coral competition, perform partial water changes, ensure stable conditions
Pest Infestation (Nudibranchs, Flatworms)
Visible small organisms on coral, tissue damage, polyp damage
Manual removal of visible pests, dip coral in freshwater or specialized coral treatment, quarantine affected coral, improve aquarium husbandry to prevent recurrence
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Quick Facts
- diet
- Photosynthetic (zooxanthellae); supplement with mysis shrimp, copepods 2–3x weekly
- flow
- Moderate, indirect
- lifespan
- Decades in well-maintained reef
- lighting
- Moderate (50–150 PAR)
- placement
- Lower to mid rockwork; space away from other corals
- tank size
- 30 gallons minimum reef tank
- temperament
- Has sweeper tentacles; moderately aggressive toward nearby corals
Water it likes
- ph
- 8.1–8.4
- calcium
- 400–450 ppm
- nitrate
- 1–10 ppm
- salinity
- 1.024–1.026 SG
- magnesium
- 1250–1350 ppm
- phosphate
- 0.03–0.1 ppm
- alkalinity
- 8–11 dKH
- temperature
- 73–81°F (23–27°C)