Is this crab good or bad ?

[JF]

Any ideas what this is
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[wade1]

Typical live rock hitchiker. It'll eat anything it can catch and grow like a weed. I had one reach 3.5" wide and I saw it maybe once in a year. IT devoured (and neatly stacked their shells) every snail in my tank. I'd remove it the second you get a chance. Great sump dwellers (for eating debris) if you don't want to 'off' it. I'd remove it while you have the chance though.

Wade

 

[JF]

Thanks for your help

 

[Manofathousandpolyps]

Looks like its eating what use to be a peppermint shrimp or something close to that. :? I would definatly take it out.