Taking another approach to this problem, it sounds like you stocked a huge amount of fish for a 1/3 acre pond. "I'm on a 1/3 acre pond stocked 40 HSB, 500 CNBG, and a few hundred tilapia in the spring". I would think that a few hundred tilapia in the spring could mean thousands and thousands in the fall. Also you indicate you put in an aeration system this year. Are you sure your system is properly sized and the aerators are in the right place?
