If I may I'd like to refer you to the recent discussion at http://www.canreef.com/phpBB2/viewtopic.php?t=12148. Remember than Xanthidae is an entire family of crabs. See an excellent discussion at http://www.reefkeeping.com/issues/2003-12/rs/. The photo you posted resembles my "Garfield" crab closely. Hopefully you or someone else has a sump where he can live as mine was quite fascinating to watch.
I'm not sure I'd be so quick to say bristleworms are a problem, even when large. Many reefers have had relatively large bristleworms with no reason to believe they were a nuisance. Again though, if they worry you, perhaps relegate them to a sump or refugium.
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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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