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The Bicolor Hammer Coral (Euphyllia anfracta or Euphyllia paraancora) is a popular large polyp stony (LPS) coral featuring hammer- or anchor-shaped tentacle tips that display two distinct, contrasting fluorescent colors. Highly sought after for adding striking color variation and fluid motion to a reef tank, it thrives in moderate conditions, making it an excellent, hardy choice for hobbyists looking to expand their stony coral collection.
Tank Requirements
Lighting: Moderate (30–150 PAR); mid-level, indirect light promotes full polyp expansion and prevents the dual pigments from fading.
Water Flow: Moderate and indirect; requires a gentle, swaying current to keep tentacles moving without pushing them roughly against its sharp skeleton.
Temperature: 72°F – 78°F (22°C – 26°C).
Salinity (Specific Gravity): 1.023 – 1.025.
pH Range: 8.1 – 8.4.
Care and Feeding
Placement: Middle sections of the aquarium, securely anchored into the rockwork where it can freely expand its large fleshy polyps.
Diet: Photosynthetic via zooxanthellae, but benefits from weekly spot-feeding of mysis shrimp, brine shrimp, or specialized dry coral pellets.
Temperament: Semi-aggressive; it develops long, stinging sweeper tentacles at night and must be kept several inches away from non-Euphyllia corals, though it can usually touch other hammer corals safely.
The Bicolor Hammer Coral (Euphyllia anfracta or Euphyllia paraancora) is a popular large polyp stony (LPS) coral featuring hammer- or anchor-shaped tentacle tips that display two distinct, contrasting fluorescent colors. Highly sought after for adding striking color variation and fluid motion to a reef tank, it thrives in moderate conditions, making it an excellent, hardy choice for hobbyists looking to expand their stony coral collection.
Tank Requirements
Lighting: Moderate (30–150 PAR); mid-level, indirect light promotes full polyp expansion and prevents the dual pigments from fading.
Water Flow: Moderate and indirect; requires a gentle, swaying current to keep tentacles moving without pushing them roughly against its sharp skeleton.
Temperature: 72°F – 78°F (22°C – 26°C).
Salinity (Specific Gravity): 1.023 – 1.025.
pH Range: 8.1 – 8.4.
Care and Feeding
Placement: Middle sections of the aquarium, securely anchored into the rockwork where it can freely expand its large fleshy polyps.
Diet: Photosynthetic via zooxanthellae, but benefits from weekly spot-feeding of mysis shrimp, brine shrimp, or specialized dry coral pellets.
Temperament: Semi-aggressive; it develops long, stinging sweeper tentacles at night and must be kept several inches away from non-Euphyllia corals, though it can usually touch other hammer corals safely.