There are 5+ polyps on each small rock.Place these zoo's in bright light with moderate flow.Add zooplankton or marine snow to the water column.Zooanthids are extremely hardy and an excellent beginner coral. They can spread rapidly so care must be taken to ensure they don?t choke out other corals.Zooanthids are photosynthetic and don?t need special feeding.Zooanthids prefer low to moderate water motion.Does well within a range of at least 76 to 84 F.Will tolerate very low light levels, but do better with stronger lighting.Often referred to as "Zoos" Button Polyps are very easy to care for and great for everyone from beginner to expert. They grow and spread very quickly and can be easily propagated.Corals are part of a biological group known as Cnidaria. Most Cnidaria have a mouth,or mouths, that opens into one big body cavity. Due to the lack of a true digestive system, this cavity acts in its place and after the food is broken down the nutrients are then sent through the rest of the body as food. There is also no excretory system; therefore the waste is sent back through the mouth or secreted into the surrounding water.Tentacles of varying size will usually surround the mouth of Cnidaria. Most Cnidaria have tentacles with stinging cells that can shoot tiny poison darts into their prey or can even be used as a defense mechanism. Some corals lack tentacles and instead cover themselves with a thin layer of mucus and use that to collect bacteria andplankton as food. Some corals even use both of these methods. Cnidaria can either bean individual animal or members of a complex colony. These "Colony Corals" share the food and nutrients taken in by each individual.Corals have tiny living organisms that actually live in their tissue. These are called zooxanthellae and they are the reason why such strong lighting is needed in the saltwater aquarium. These algae-like creatures provide the coral with oxygen and other nutrients that are produced during photosynthesis. During this process, the zooxanthellae take up carbon dioxide and provide nutrients to the coral.