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My understanding is that the emerald and the reddish version are both in the same group of Mithrax crabs. I have some of the reddish ones in my tank, that came in as hitch hikers on my Florida aquacultured live rock. I've been keeping an eye on them, and they do eat valonia and other macroalgaes like the emrald mithrax crabs. So far they haven't bothered anything else in my tank.
 
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