Common name: Branching Hammer Coral

General information

The Branching Hammer Coral, Euphyllia ancora, is a popular large polyp stony (LPS) coral known for its distinct hammer- or anchor-shaped tentacles. It is a favorite among reef aquarium enthusiasts due to its movement, color variety, and relatively easy care requirements. This coral can come in a range of colors, including green, brown, purple, and even gold.

Care

Hammer Corals require moderate to low water flow and lighting to thrive in a reef aquarium. They benefit from stable water conditions and the addition of calcium, alkalinity, and magnesium to support their skeletal growth. It's important to provide ample space between Hammer Corals and other corals to prevent aggressive interactions as they can extend their sweeper tentacles at night to sting nearby corals.

Symbiosis

While not hosting fish like anemones, Hammer Corals can have a mutualistic relationship with certain cleaner shrimps and clownfish, which may seek refuge among its tentacles. The coral provides protection, while the fish or shrimp may help keep the coral clean from detritus and parasites.

Habitat

In the wild, Branching Hammer Corals are typically found in shallow reef environments where they can receive plenty of light but are protected from strong currents. They are distributed across the Indo-Pacific region, often in lagoons and on reef slopes.