I love my emerald crab, "Oz"! He never hides and he loves to try to look big and tough in front of the fish. When someone gets too close he throws his claws in the air and stands on his tippy-toes. The only thing that he has ever done was knock an umbrella coral off of a rock, when he was trying to eat the hair algae underneath it. (I had just gotten it and it wasn't attached to anything yet.) He leaves everything alone and is a GREAT algae eater! Definitely a plus in my book! :yes: