I think if you have a big enough tank, you could just leave the crab. Unless you have very small fish he could easily catch, I doubt he'll be a problem. Bev has license, as she has a fairly small tank. Myself, I would probably leave any red eyed crabs. The occasional sniped polyp isn't a big deal. However they do make great sump dwellers, I have one of Bev's living on a single piece of rock between two baffles. There are plenty of amphipods in there to keep him company (or well-fed).
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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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