I have in the past kept red eared pond sliders, paints, softshells and snappers in tanks with my game fish, and obviously the snapper had to go for eating all the panfish. The others were happy just eating the goldfish and minnows id put in the tank to feed the fish, and the biggest paint I had grew to 14 inches across. I ended up releasing the turtles into a local pond and I can only assume they survived. When I get some more $ ill do another fish and turtle setup.