Feeder Guppies are generally highly inbred, disease ridden, poorly raised fish that are not fit for anything to eat. If you are interested in breeding your own feeders, find a store that sells quality guppies (or another species of livebearer fish) and pickup a dozen females and a few males. You'll likely need to add in new females every half year as the constant breeding shortens their lifespan significantly. Keep them in a plain tank with a large clump of live floating plants, and a clump of yarn on the bottom. This will give the young refuge from the adults. Feed live brine shrimp for good growth rates.