Just put one of these guys in the tank. What do I need to look for in these guys? He seems to hang at the bottom on the sand. Not sure if this is normal or not. My lfs told me to watch him and don't let him fool ya because they like to play dead on the bottom at first. Got him some mysis shrimp for now. Haven't fed him yet either. Thought I'd let him get used to the clowns first. Any suggestions?