The Xanthichthys genus are plankton-feeders. From what I've read any of them is a good bet and safe apparently even with inverts. I would attempt to obtain one or a pair if you have the room/money from J&L, since I don't shop at the only place in Calgary I've ever seen them. Bob Fenner also suggests the members of the Sufflamen genus but I'm not sure if everyone would agree with it or not.
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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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