Common name: Hammer Coral

General information

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

Care

Hammer Corals prefer moderate lighting and water flow. Too strong a flow can damage their delicate tentacles, while too little can lead to a build-up of detritus and harmful bacteria. They benefit from the addition of calcium, magnesium, and alkalinity supplements to maintain robust skeletal growth. Feeding is not strictly necessary as they host zooxanthellae, but they do appreciate occasional feedings of meaty foods like mysis shrimp or finely chopped seafood.

Symbiosis

While not known for hosting fish, Hammer Corals can have a mutualistic relationship with certain cleaner shrimps and small fish that may seek refuge among their tentacles. These animals help keep the coral clean by removing debris and parasites.

Habitat

Euphyllia paraancora is found in the Indo-Pacific region, typically in shallow reef environments. They are often located in areas with moderate water currents which help deliver food and remove waste products.