How long have you had the clown? Has he eaten since you set up tank? They aren't very picky eaters, but switch diet as much as possible. Have you tried live brine shrimp? Usually fish are attracted to moving food. If he isn't interested in that, I think he may be sick. Also try to setup your live rocks with cave area so fish can retreat to safe area. Make sure to test your water JF228, take water samples to Exotic if you don't have test kit. Also record how well tank is running. You may find something is not right. *twirlysmiley*