Hammer corals (Euphyllia or Fimbriaphyllia species) are popular large polyp stony (LPS) corals known for their flowing, hammer- or anchor-shaped tentacle tips. They provide great motion and vibrant color to a reef aquarium.
Lighting Requirements
PAR Range: Keep them in low to moderate lighting, roughly 80 to 150 PAR (some can tolerate up to 250 PAR, but lower ranges prevent light shock).
Spectrum: A strong blue and violet spectrum helps bring out their neon coloration.
Placement: Position them in the lower to middle sections of your aquarium.
Water Flow
Current: Provide moderate, indirect water flow.
Motion: The tentacles should sway gently (“lightly dancing”) in a random or pulsing current without being blasted or pinned to one side.
Warning: Too much direct flow tears the delicate flesh against the skeleton, while too little allows debris and sand to settle and cause infections.
Water Parameters
Temperature: 75°F – 80°F (24°C – 27°C)
Salinity: 1.024 – 1.026 SG (1.025 ideal)
pH: 8.1 – 8.4
Alkalinity: 8 – 12 dKH
Calcium: 400 – 450 ppm
Magnesium: 1250 – 1350 ppm
Nutrients: Nitrates around 5–10 ppm and phosphates around 0.05–0.1 ppm help support health and color
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