Flake food is cheap and goes a loong way....though loaded with phosphates. Frozen foods for carnivores and omnivores is a more natural route. Alot of people, myself included, alternate between the two choices. But, the best advice is as wide a variety within the confines of their natural diet. From what i have researched, clownfish are omnivores and a mixed diet is the first insurance to a long, healthy, disease free lifestyle. For added nutrition you can also find Selco at aquacave.com for significantly cheaper than anywhere else i have found.