convicts or any fish breeding prodjuct isnt worth the time, money and aggravaction in my opinion to use a feeders. For one you would have to have atleast a 30 gallon tank for the pair of convicts. And three or 4 other small tanks just for the different size fry. And Will cost more money on the power for the tanks. and the food for those fry tanks then its worth. And still not have enough fry to be able to feed on a regular basis. I did it with a pair and was such a head ache. Again this is just my opinion. Go over to the breeding section and read up on it. Tons of threads in there on breeding convicts and just about any thing else you would ever want to breed as feeders. If you want a breeding prodjuct its fun. Other wise not worth it. Just feed um some red warms, black worms, blood warms instead or mysis shrimp, ghost shrim, frogs, meal worms, silk warms, super warms ect. They are all cheap and easy with no added maitnence.