Cyclopeeze is a great food for clownfish. I also recommend Mysis shrimp and other meaty preparations. Brine shrimp should not be used as a staple in their diet, but as a "treat," so to speak. It provides them with little actual nutrition, but they sure do think it's delicious.
Formula 1 (frozen, flake, and pellet) are all good options for clownfish. I feed mine primarily Formula 1 flake, mysis, and cyclopeeze, but also have ORA-Glo pellets and Reef Herbivore pellets that I feed from time to time for some variety.