not a good ideal, I do not suggest feeder fish at all unless you raise them yourself, gold fish and the such are out, cold water fish are not good for warm water fish and if you buy them, you are exposing them to decease and parasites. if you are looking for a protean treat feed freeze dried krill soaked over night in boyds vitachem and once or twice a week, preferably the night before water change as x amount of protean = x amount of ammonia = x amount of nitrite = x amount of nitrate.