Thanks guys, one week in the tank now, haven't actually seen it since last Wednesday. However while I was at work yesterday he decided he wanted to eat everything in the tank. Corpses of two emerald crabs, two fiddlers and a half dozen hermits or snails (never know what was in them) were in a pile on the sand. Carnage is really the only way to describe it, poor crabs were in so many pieces I couldnt tell which piece came from which crab; I guess it was hungry. Yet the fiddler in the cup remains untouched, maybe he doesnt like the plastic cup, I find it hard to believe he couldnt figure out to reach in the top if he wanted to.