Knob Coral

About

Knob Coral (Mussismilia leptophylla) is one of the few reef-building corals endemic to the Southwest Atlantic, found exclusively along the Brazilian coastline from shallow nearshore reefs down to around 30 meters. That regional exclusivity makes it an interesting piece of natural history for hobbyists drawn to less commonly kept species. The colony structure is characterized by the rounded, knobbed surface forms that give the coral its common name. Each knob marking an individual polyp, producing a textured, sculptural appearance quite different from the smoother large-polyp stony corals that dominate the hobby. Colors tend toward earthy greens and browns, occasionally with warmer tones depending on zooxanthellae density and lighting conditions. As a large-polyp stony coral adapted to Brazilian reef conditions, it tolerates a reasonable range of conditions and is considered approachable for hobbyists who already have some experience maintaining reef aquariums. Moderate lighting and moderate flow suit it well, and it does not demand the intense light intensity that some SPS corals require. Because it is a true reef-building species, it appreciates stable water quality and consistent calcium and alkalinity levels to support steady skeletal growth. This is a geographically distinctive coral that brings a slice of South American reef diversity to the home aquarium.