For my gars when they were babies, I just went to the LFS and got a bag of guppies and threw them in the gar tank. When I didnt see any more guppies, I threw in another bag. A bag had about 50 guppies or so in it. Baby gars need a constant food supply to grow and develope properly. They eat when they get hungry. As the gars grew I switched to rosies. Once they reached about 6-8" I started feeding very small talapia chunks, but still kept rosies in the tank for them to munch on. It wasnt until my gars reached over 12" that I took them off feeders completely and switched to talapia and pellets.