A couple days ago I looked in the tank and 3/4 of my green tree was gone. The next day almost all of my pulsing xenia was gone. Today i see a new cave under one of the rocks and shined a light in there and something moved. I reached in there with a pair of tweezers and pulled out this guy. I looked up gorilla crabs and saw no 2 alike. The term was used loosely for any hairy crab thats a carnivore. The funny thing is....it looks like a gorilla. Is this indeed what this is and would it be responsible for eating my corals.