Common name: Spine coral

General information

Hydnophora Coral, also known as Horn Coral or Ridge Coral, is a species of small polyp stony (SPS) coral that is popular among reef aquarium enthusiasts for its unique growth forms and vibrant colors. Hydnophora rigida is characterized by its rigid, branching structure with prominent, pointed coenosteum ridges that give it a distinctive appearance.

This coral is found in a variety of colors, ranging from green to brown, and sometimes with fluorescent tips. It is known for its aggressive behavior, as it can extend sweeper tentacles to compete for space and resources with neighboring corals.

Care

Hydnophora rigida requires stable water conditions and intense lighting to thrive in a reef aquarium. It benefits from moderate to strong water flow, which helps to keep the coral clean and deliver nutrients. Care should be taken to provide enough space between Hydnophora and other corals to prevent aggressive interactions.

Feeding is not essential, but the coral can benefit from occasional target feeding with microplankton or other suitable coral foods to promote growth and coloration.

Symbiosis

While Hydnophora rigida does not have any specific symbiotic relationships like those seen with clownfish and anemones, it does host a variety of microfauna in its structure, which can contribute to the overall biodiversity of the reef aquarium.

Habitat

Hydnophora rigida is found in the Indo-Pacific region, typically in shallow reef environments where it is exposed to strong light and water movement. It is often seen on reef slopes and in lagoons, where it forms part of the complex reef structure that supports a diverse range of marine life.