Knob Coral

About

Knob Coral (Dipsastraea lacuna) is a stony coral belonging to the family Merulinidae, a group that includes many of the dome-shaped and boulder corals familiar to reef hobbyists. Its surface is textured with the characteristic raised corallites and fleshy polyp tissue typical of the Dipsastraea genus, giving colonies a warty, knobbed appearance that distinguishes them from the smoother profiles of some related species. In the wild, this coral is found across a broad geographic range, turning up on reefs throughout the Indo-Pacific and beyond, generally in areas with moderate light penetration and reasonable water movement rather than extreme surge zones. Aquarium care falls into intermediate territory. Not particularly unforgiving, but not the right pick for someone still sorting out the basics of reef chemistry either. It appreciates consistent conditions more than it tolerates swings in alkalinity or salinity, so stable husbandry matters more than hitting any single perfect number. Flow should keep detritus from settling on the tissue without blasting the polyps directly. Given steady parameters and appropriate placement under moderate lighting, colonies will extend their polyps during feeding periods and show good color over time. A solid choice for a maturing reef tank where the fundamentals are already dialed in.