Spine Coral

About

Spine coral (Hydnophora grandis) is one of the larger and more assertive members of the Hydnophora genus, found across the Western Central Pacific from shallow reef flats down to around 40 meters depth. The genus takes its character from the distinctive raised projections, called hydnophores, that cover the colony surface and give these corals their common name. Hydnophora grandis develops into a substantial colony over time, and its form can vary depending on light and flow conditions, making identification sometimes tricky in the wild. In the aquarium, this species earns its intermediate care rating mainly because of its aggressive tendencies rather than any strict demand for pristine water quality. It will extend sweeper tentacles to defend its space and can damage neighboring corals if placed too close, so thoughtful positioning in the tank is essential. Give it enough room to grow without encroaching on other colonies, and it will reward you with an architecturally interesting centerpiece. Moderate lighting and moderate flow suit it well, and it generally handles typical reef aquarium conditions without too much fuss. It is not a coral for an absolute beginner, but a keeper with some reef experience should find it manageable provided placement is planned carefully from the start.