I have tried 2 different frozen foods, pellets, shrimp pieces and seaweed, but I have not seen this clown fish eat since I purchased it. Now mostly lying on the bottom where before he was swimming actively all over the tank. I have checked ammonia, nitrate, phosphate, ph and alk and all is within limits. Do not know what to do next. No sign of ich or any other disease that I recognize (but I've only been doing this for a few months) fins and color look fine. I have a second reef tank that is doing great. This particular tank with the clown has gone through a patch of the algea uglys. One of the shrimps is hanging around him like he expects him to croak any minute. Clown is a little over 2 inches in size. Tank is a red sea 20 cube and the protean skimmer works great. Only 2 engineer goby fish also in tank along with several snails, a sand sifting starfish (was out and about yesterday), conch, a fire and a cleaner shrimp and other misc snails.