I bought a 30 year old 7 acre pond in southwest GA a year ago.I was told it had a few crappie in it which was verified by Greg Grimes during a survey. I went fishing for them for the first time last weekend and caught 30 10 inch +. How much of a problem is this and can it be corrected without draining the pond and starting from scratch? Any help would be great. I really enjoy this site you have helped me a great deal.