they are photosynthetic (lots of light to help them make their own food) they also eat small fish, inverts (crabs, shrimp, etc.), as well as thawed out frozen food. they will normally eat anything that gets stuck in their tenticles. if you have a clown fish the fish will serve the anemone food, and therefore direct feeding is not necessary.
one fish, two fish, red fish, blue fish- Dr. Seuss