Small Polyp Stony Coral, also called SPS Coral, are a favorite among experienced and beginner hobbyists. SPS Coral build a calcium carbonate internal skeleton that form unique shapes, Often Branching or plating. SPS coral need a fairly consistent level of calcium and alkalinity. Their demand can be much higher than LPS, and soft coral. Most SPS need stronger water flow, high light intestity, and Optimal water quality to ensure bright colors and rapid growth.