It would be interesting having only a BCP pond but with that be said if you want your crappie to get somewhat big you would of course have to have an apex predator. I wonder if the pond could be balanced by putting muskie or pike in it. I would assume the muskie/pike would control the BCP numbers but idk since I've never tested it. Also it would be neat to see a self sustaining white bass population. I've heard Norm had white bass but i don't believe his was self sustaining . Definitely something I will try to do in the future.