The beauty of a mini pond that's easily drained/seined/refilled is one can launch experimental fisheries with little downside. I would imagine very intensive management would be needed if the pond remains a pure BC pond. Or, you could consider as many suggest adding some Apex predators to help you control numbers. I think 10-20 single sex LMB would be an interesting solution - sounds like Ozark has some experience with this and it yielded good results.
I love the experiment, we all can learn something new potentially from your efforts! Keep us in the loop.