U should buy it prawn or some cocktail shrimp to eat. Feed them the food with the shell on, and he will begin to wear his jaw down. It also helps to have a bunch of live rock, cuz they will chomp on it sometimes. Just try out the shell fsih for a while, and if u can get ahold of live crabs and crawfish, that outta work too. THey need some sort of shell for them to chow on to wear their beaks.