I forget how old your pond is…. My one year old LMB are 5-6” long on average I’m thinking. My BCP have not stunted as they are eaten by LMB. Catch very few of them now but not stunted . Rusto probably good to have a balanced pond instead of just a few large predators. But I’m not even able to keep a population of BCP going in 6 acres…..lol