Do the grass carp help? I have a small 1/2 acre pond that is filled with Bass, bluegill, crappie, and perch. It is also weed choked at the moment. I don't feed them anything, unless it's at the end of my fishing line /forums/images/graemlins/smirk.gif...they get plenty of food however as my 2 and 1/2 year old son caught a 17.5 inch Largemouth that weighed about 3 pounds just last week. How many grass carp did you put in?