Thanks Mike, so the LFS is rite about it eating detritus and coral food, but they told me that if I fed my coral often then I didn't have to worry about it being starved. So I guess Im gonna keep it. Here's what I found on the net:
Crinoids, above left (pic), also known as "feather stars" or comatulids are harmless, colorful creatures. They are among the most ancient and primitive of ocean invertebrates. Crinoids are Echinoderms (members of the Phylum Echinodermata, meaning "spiny skin"). To feed, they extend their arms to catch bits of plankton or detritus (waste matter) passing in the current, making them "suspension feeders". Tiny fingerlike tube feet that line the featherlike arms flick passing bits of plankton into special food gutters that run along the center of each arm; microscopic cilia carry the food along the gutter floors to the mouth. The number of arms a Crinoid has varies widely between species; some may have as many as 200, each up to almost 14 inches in length. Crinoids are distinguished from other echinoderms by the fact that their mouth is pointed upward, unlike their starfish cousins. There are nearly 550 species of comatulid crinoids worldwide.
Strictly speaking the creatures featured here are comatulids, members of the Class Crinoidea, along with sea lilies (similar to comatulids but with long stalks). Collectively, comatulid crinoids and sea lilies are referred to as crinoids, since they are both members of the Class Crinoidea. Here, as in the somewhat non-scientific SCUBA diver community, comatulids are most frequently labeled simply as crinoids or "feather stars". For complete, detailed scientific information on comatulid crinoids, visit Charles Messing's Comatulid Crinoid Page.
Crinoids are usually admired by divers for their bright colors, but few pause to look closely enough to see they are host to a number of tiny commensal animals, such as shrimp, clingfish, and squat lobsters. The ability of these creatures to master the art of disguise is amazing. Personally, I enjoy the tiny creatures of the reef more than the larger, pelagic animals. From a photographer's viewpoint, these tiny creatures are often better film subjects. Though photographing many of these tiny commensals on a crinoid is like chasing a squirrel around a tree, the results are very rewarding. Often the macro photograph reveals much more detail than may be seen with the
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