I feed mine the following:
Krill, silversides, earthworms, bloodworms, tilapia, market shrimp, clams, mussels, octopus..
I occasionally throw in massivore, and hikari cichlid pellets (for the other fish).. but they aren't really interested. I am going to be buying carnivore, as it's smaller.
I have 7 motoros, and a flower ray.