The clam was just bought from the lfs. He crawled on it once it closed, knocked it over and I reset it, but then I didn't pay attention for the next hour and found him ripping the flesh out. Got him off the clam and the clam was already ripped apart and not responding/closing. He is an electric blue knuckle crab his shell is about the size of a golf ball maybe a bit smaller like a ping pong ball; he is pretty strong. When I grabbed him he clung on the clam all the way out the water no problem. He played Probably pryed it open