Ah Brad, the voice of reason. Suffice to say that like he said said, crabs are not necessarily bad, just that they are often omnivores. They're not out to kill your gobies and zoanthids, but if they get hungry, what else can they do? If you're really uncomfortable with them, then do remove them, but attempt to find them a sump to call home. It just seems cruelly ironic that these creatures so often survive the transit from the South Pacific to North America, only to be fed to a trigger or something like that.
Thank you for not beating me up and no I am not a tree hugger. 
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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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