It's a gorilla crab :evil: It wasn't doing any damage YET, but just give it some time. I'd notice it late in the evenings eating coraline algae most of the time. You deffinately want him out of the tank before you add any livestock. Hope that helps.
http://www.tbsaltwater.com/thepackage/watchout.html

THATS HIM :evil: i can tell by the black claws!!!!!!
he didn't go for the bottle trap, and i tried to nab him last night but he darted under some rock. so i guess i'll keep trying the bottle trap :cry:

OK you guys if you go outside and listen you can probably hear me cursing from where ever you live. I have tried the bottle trap for the last 5 nights! NO CRAB! Any other ideas out there?

well i was wrong there is TWO :eek: ....one has these evil red beatie eyes :evil: realy creepy. and the other is all back. trying the bottle trick right now. hope it works

chop sticks or any other pointy stick.... stab away :eek: ... sounds evil but you gotta do what you gotta do