I think they're innocent until proven guilty... there are SO many undocumented crab species, that you can't predict how it'll behave by looking at it.
but that's my opinion.
I actually found a crab hitchhiker that I quite like on my own rock. It's exactly like an emerald crab, yet black. it's behaved himself quite nicely for a month now.
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Everything I put in my tank is fully dependant on me.
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