by marvinpb » Tue Nov 17, 2015 10:55 pm
I don't know about the id.
I have at least 3 crabs in my tank, 1 looks slightly like this, 1 is lighter color, and I think 2 pure black.
all started as small but now they have grown, some about 1inch body.
they are all elusive, not seen often. i see them eating/biting on the rocks, maybe eating detritus.
I think they eat fish only if the fish is dead or weak.
i didn't put much effort in catching them because i think they are reef safe or fish safe(at least for now).
the only thing is they are knocking down my coral frags.
hotshot its up to you to observe, if coral safe or fish safe.
if in doubt just remove it. good luck catching it!
180g mixed reef tank, 70g sump