I feed mine tetra marine flakes, spirulina algae flakes, and small marine grow pellets. Also, once or twice a week i treat them with mysis or brine shrimp, although, my clown only eats one or two. Everything else in the tank loves them.
Of course all of the above are given in extremely small portions, once or twice a day.
My fish seem pretty happy, full of life and color. :happyfish
This could be totally wrong though, so if someone out there has a better diet please post it. I am only writing what I have given, but I am here to learn like everyone else.