An easy-care coral, Button Polyp, Zooanthus sp. , adds variety of shape and color to the reef aquarium. While Button Polyps grow in a matted cluster, they are not connected by a common base. It will grow in many lighting conditions, but prefers medium to higher light levels for best growth and expansion results. Water flow level should be moderate, neither too strong nor too weak. This coral has a medium aggression level and does require placement where it has room to grow without making contact with other corals, to which it may cause harm. By placing "starts" at several locations, it can make a dramatic carpet effect over time. Though it produces its own natural nourishment in the wild, Button Polyps can benefit from occasional target feedings of plankton or brine shrimp, as well as foods designed for filter feeders