- Alkalinity: 8-11 dKH - Calcium: 380-450 ppm - pH: 8.1-8.4 - Temperature: 74-78°F - Easy to moderate to keep - Description: Hammer corals, an Euphyllia species, have hammer-shaped tentacles that expand in flowing currents. They thrive in stable conditions, moderate lighting, and gentle flow. Recommended for hobbyists seeking a unique coral with captivating movement.