Ah, the rare sasquatch crab! What a find! I don't know what it is either but it's pretty neat looking, hope it's good too!
EDIT: I've been googling and reading for the last few minutes and the general consensus seems to be that the hairy brown crabs are bad for your live rock and corals. The quote given for hitchhiker crabs, if it is unknown whether they are beneficial, "When in doubt, get them out". Heh.
i used a small screwdriver and ever so gently pried him outta the rock....i didnt hurt him one bit.....i dont wanna kill it, but dont wanna put it back in the tank, and i dont have a sump....what should i do with it?