Starfish are named after the obvious star shape. They vary in size and color, but most Starfish have several or more arms, and all Starfish have many tiny feet that move them about. Starfish are found in all environments and do well within a coral reef or rock reef. Some will eat small invertebrates and coral, so some are reef safe and some are not. Starfish are quite flexible and can maneuver in and around tight spaces. If they fall over, they will usually turn themselves upright.