You are correct it is my neighbors pond. They don't really use it for anything, they don't fish or swim in it, it is just part of the property. It was built at the same time as the house, 2010ish i think. They pretty much let me do anything I want with it but draining it and killing it off is not really something they want to do. There are also some good sized crappies in there, they don't appear to reproduce or if they do it the bass eat all of the young. Would removing them help?