I have a couple Fry in a new 500 gallon pond along with a fairly large catfish, a bluegill and a small perch. Whats the best thing to feed these fish? Not worried about the catfish. I think he eats almost everything I put in there (except the fry so far). 2 dozzen rosey reds disappeared over night. Think the small fish ate them or the catfish? Im worried they might starve because of the catfish. Any way to know if they are eating without actually seeing them eat? Will nature help out with live food they will eat?