Cecil,
I ended up using 100 1/2 lb. nile tilapia (~7-9") in my 1 acre pond last year. I had about a 10' ring of FA all the way around the perimeter and they cleared it up completely in less than two weeks. By November 4th, they had died and were about 12+ inches and 1.5-2 lbs.
-Chris 1 acre pond Currently managing: FHM, GSH, GSF, BG, PS, RES, LES, YP, SMB, LMB, HSB, RBT, WE, CC, FHC, and Grass Shrimp 
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