I have permission to fish a pond that someone threw in a couple of flatheads. I don't know how many were put in but the owner said they had to go. There are very few fish left in the pond. Supposedly all of them have been caught. I saw one get caught and I took it to the creek. Last year we caught a more fish than we had in several tries but there were not many fish. I would strongly suggest you get the flathead out as soon as you can. The bullheads won't cause as much of a problem.