specifically, it's the emerald crabs they sell, who will eat pest algae, such as valonia (bubble algae). however many people have observed that mithrax crabs, if hungry, will eat corals and even fish. this being an unidentified species, i would not want him in my reef either (hence why he will be living in the sump).
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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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