I just caught a crab that is the size of a casino chip.  I think its a Gorilla, Iv'e had them from my rock in the past.  I have never seen him until tonight, he was just walking out in the open with the lights on.  I v'e had my tank going since June, so hes been unseen for quite some time.  Anyway, he is hairy but from a picture of an emerald I saw, he kind of looks like he could be an emerald.  i'll try and post a pic later.  What are the main differances between emerald and gorilla graps appearance wise.  i know gorillas look thorny, this one is so big i would hate to toss him if he is an emerald.