Tons of kinds to choose from:
For frozen foods, I feed:
Brine shrimp, Beefheart, Bloodworms, Mysis shrimp, Krill & Silversides (Frozen Minnow looking fish).
For pellets: Hikari Sinking Carnivorous Pellets & HBH Cichlid Attack!
Sometimes I also feed Tetra Tropical Granules and Tetramin Variety Wafers(meant for the Cories & Angelfish but eaten by all).