you will want to feed them saltwater fish instead of FW. FW feeder are lacking lipids and other essential things that you cannot get from a FW feeder. also when you feed them that much I would get a bigger tank. they will grow very rapid. I had one in a 20 gallon and I fed him 1 shiner a day and he was 7 inches and within about 8 months he was over a foot long. they grow fairly quick. they are awesome pets. I had it to where I could hand feed mine. they are blind as a bat but the sense of smell is very keen.