re: Cast Iron Sugar Kettle with Fish

Rust isn't going to hurt the fish. Don't put full size gold fish or koi, I personally would put sunfish in it if I was doing something that size. If it is in the shade you could get away with fancy goldfish (the fat body ones) but I would 100% recommend putting netting as they are too slow to swim away from predators. No matter what, netted or not you will get snakes in a sugar kettle, just expect it.