Even though they aren't always visible, Serpent Starfish are quite active and keep the rockwork clean of any detritus. During feeding time, their arms can be seen waving from nooks in the rocks, as they hope to catch floating bits of food. They can be target fed with a piece of shrimp, but it seems to be unnecessary. You can find them in different colors, some have stripes or other markings. Reef-safe.