I have 2 redtail catfish that are about 16'' and 9''. I have been researching and experimenting with foods for them. Does anyone with rtc or other large cats have any suggestions of things for me to try? I have seem many people use shrimp but what kind of shrimp is this? Also what sort of fish fillets can I use? Any other meats? I would like to start of make my own frozen food for them so that I have have alot of food for a fraction of the price.