Well, with my baby reds I switch between bloodworms, brine shrimp, black worms, and a food I tailor made from my Oscar. (It's made of beef heart, shrimp, peas, chicken livers, spinach, and processed fish foods of a few different sorts.) I also got them a few feeders when they first got home, six two be exact, three were dead as soon as they hit the water. My girlfriend's breeding betas, and I intend to use some of her culls for food, and she's planning on picking up guppies as well and I'll be doing the same with them.