Would it make a difference what vegetation you are dealing with? My pond got a very early infestation of Curly leafed pond weed. I put in 4 grass carp last year - one died. The pond weed went from bad to really bad this year. I added 4 more GC. I am not after eradication but in my pond (about 3/4 of an acre) there are probably way too many hiding places. I am hoping for a balance where they can keep the weed down but not entirely eliminate it. I also have some rock structure, some pine trees, cattails and bulrushes that supply more cover. I never knew how complex an issue it was to manage a pond. I'm a bit overwhelmed with the information I find here but I'm trying to absorb the things I need to know for my situation.
