crinoid, filter-feeder. take it back and tell the LFS to stop stocking them  not an good aquarium specimen
http://www.wetwebmedia.com/crinoids.htm
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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