Lesser Star Coral

About

Lesser Star Coral (Goniastrea thecata) is a reef-building species native to the Red Sea, where it grows on semi-exposed reef slopes from the shallows down to around 30 meters. In the wild it forms massive boulder-like colonies that can exceed a meter across, and that slow, steady growth habit carries over into aquarium specimens, which tend to be compact and robust rather than fast-spreading. The skeletal structure is immediately recognizable once you know what to look for: corallites are irregular in shape, with thick walls and tightly alternating septa, and the fleshy polyp tissue extends above the skeleton in a way that gives the coral a slightly raised, almost puffy rim. A trait sometimes described as subplocoid. Columellae form distinct centers within each corallite, which helps separate this species from similar massive corals at a glance. Coloration is a cool steel grey, subtle compared to many reef animals, but there is a clean, architectural quality to the colony structure that appeals to keepers who appreciate texture and form over bright pigmentation. Care sits at the intermediate level, requiring moderate light and moderate flow to keep the tissue healthy. It is reef safe and a reasonable choice for a hobbyist who has moved past the beginner stage and wants to explore less commonly kept Indo-Pacific stony corals.