Introduction to Hammer Corals Hammer corals (Euphyllia ancora) are a stunning addition to reef tanks, known for their distinctive hammer- or anchor-shaped tentacles that gently sway in the current. They come in a range of captivating colors, including shades of green, gold, and even bi-color varieties. These Large Polyp Stony (LPS) corals add both movement and visual interest to aquariums, creating a dynamic and natural reef-like aesthetic. While they are not fully peaceful, Hammer corals are considered semi-aggressive due to their long sweeper tentacles, which can sting neighboring corals if placed too closely. With proper spacing and care, they can thrive and become a focal point in any reef tank. Location Hammer corals are native to the Indo-Pacific region, thriving in reef environments from Indonesia and Fiji to the Great Barrier Reef. They are commonly found in lagoonal areas and along reef slopes, where water movement is moderate, and light levels are diffused. In the wild, these corals anchor themselves to rockwork or rubble in sheltered areas, allowing their tentacles to extend freely while avoiding excessive stress from strong currents. Their placement in these reef zones provides an ideal balance of flow and light, ensuring their long-term health and vibrant appearance. Water Chemistry Hammer corals thrive in stable, well-maintained water conditions. Maintaining the following parameters will support their health and vibrant coloration: Calcium: 400-450 ppm Alkalinity: 8-9.5 dKH Magnesium: 1250-1350 ppm Nitrates: 5-15 ppm Phosphates:
