Here's a recent thread on identifying crabs: http://www.canreef.com/phpBB2/viewto...highlight=crab. In short, it's difficult for us non-PhD types to do, and I would either remove him if you're worried he'll cause problems, or leave him until he does.
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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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