Knob Coral

About

Knob Coral (Dipsastraea laxa) is a colonial stony coral found across a sweeping range of the Indo-West Pacific, from the Red Sea and the east African coastline all the way out to New Caledonia, and as far north as Japan. In the wild it occupies reef environments at depths of roughly 6 to 25 meters, making it adaptable to a range of light conditions on natural reefs. Its common name comes from the raised, rounded corallites that give colonies a distinctly bumpy, textured surface. A useful identification feature when comparing it against other members of the Dipsastraea genus. Coloration tends toward earthy greens, browns, and golds, which fits the understated palette typical of large-polyp stony corals from this group. In a reef aquarium, Knob Coral is considered an intermediate-level species. It does not demand intense light or high flow, sitting comfortably under moderate conditions of both, but it does expect stable water quality and the consistent attention that any LPS coral requires. It is reef safe and poses no unusual threat to neighboring corals beyond the standard need for adequate spacing. For a keeper with some experience maintaining stony corals, it is a solid and geographically interesting addition to a mixed reef system.