shrimp stuff, brine shrimp, shrimp pellets, baby ghost shrimp. They arent that picky though so im sure you can feed them flake food, but you should buy some sinking pellets while your at it. They also like the occaisonal treat of worms but i only feed them frozen worms once every two weeks. My rams eat algae wafers as well so thats there veggies. IMO not picky. Just make sure you put the food right next to them as they mine dont hunt.
My bolivian ram diet:
Monday-Friday: Sinking shrimp Pellets
Saturday: Frozen worm mix (blood, black, tubifex) or Frozen Brine Shrimp
Sunday: Frozen Vegetable meal or Algae wafers