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Hammer Coral
Euphyllia ancora
Family: Euphylliidae
📍 Indo-Pacific Reef Systems
Hammer coral is a large polyp stony (LPS) coral with distinctive T-shaped or hammer-shaped tentacles that sweep rhythmically in current. It is photosynthetic via its zooxanthellae but also benefits from target feeding with meaty foods two or three times weekly. It can sting neighbouring corals, so adequate spacing is essential.
Keeping this species
- diet
- Photosynthetic (zooxanthellae); supplement with mysis shrimp, copepods
- flow
- Moderate, indirect
- lifespan
- Decades in well-maintained reef
- lighting
- Moderate (50–150 PAR)
- placement
- Lower to mid rockwork
- tank size
- 30 gallons minimum reef tank
- temperament
- Has sweeper tentacles; aggressive toward nearby corals
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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)
Natural Habitat Temperature
79°F — 81°F seasonal range · (Jan low, Feb high)