How thick were the arms? A lot of us have small brittle stars scattered amongst our rocks. In some cases they seem to have originated from a single source in Calgary, and appear to be a common hitchhiker elsewhere. Regardless, it has been decided that ours are filter-feeders, and assuming this is what you have, and noting the arm-waving behaviour exhibited by yours, I would expect that this is what you have as well. Shouldn't be a problem.
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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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