DD....this is a touchy subject, but IF you decide to do grass carp to control excess vegetation, IF you do, DO NOT over do it. For example: If "experts" tell you that one per acre is what's needed, and in 3-5 years it'll be well balanced, DON'T put in 5 per acre to get it done quicker. It is a process that MOST folks greatly over do. My little 1 A. pond has ONE grass carp in it, and it does just fine. He got to be about 3 feet long and I took him out and put a 10" replacement in. Smaller fish eat more than the larger fish do in this regard....or so I'm told. A friend had a beautiful 5 acre lake that got 'weedy'. Conservation guys told him to put in 4-5 grass carp. He put in 15...wanted it done in a hurry!! In less than 3 years they had eaten all the vegetation around the shore line and the lake began to silt in dramatically. He almost lost it!!! Just a friendly FYI..