Did you just get him recently? Is he in a tank with other faster bottom feeders? I've had my 4 Raphaels over 18 months and they still won't eat until after the tank and room lights are out. These fish are hiders during the day. I would expect him to be super extra shy if he's new. Anyway, mine love algae wafers, cichlid flakes and bloodworms. I turn on the red lights on the tank after dark and they come out scooting all over the place. They take forever to grow, too.