Well, if I were you i would try not to get them on a diet of feeders, the reason being these can easily carry parasites, and also can get your fish to be aggressive, and accept nothing but feeders which can get to be very expensive, frozen food is good, but pellets are even better if possible, but if your going to id pick up some rosie reds and quarantine them for at least a week or so, just to be safe on the parasite or illness factor.