I grow out chain pickerel this way over winter to add to uncle's farm pond. Neat to watch as you need to feed them live fish. Only issue as mentioned above is you can't fit too many fish in a small tank. I run normal filtration and change the water periodically and also add aquarium salt to keep disease down. I always wonder how they will survive in the "wild" of the farm pind once released as they are used to being fed and don't have much room to swim around in the tank. I wonder if they get eaten by larger fish quickly or at least maybe have a tough time finding their own food since they are used to being hand fed.