Very interesting thread! Donnie, thank you for sharing your story. Your situation has definitely educated me. I'm guilty for using aeration as a safety-net while spraying weeds (killing more than probably should be). I have yet to encounter a problem, but.........
Donnie's situation was tough. A small pond, lots of fish, and effluent from a cattle pasture. At any given moment, every pond has a threshold for disaster.
My clients that have heavy feeding regimes & dense fish populations all get Vertex aeration with a Kasco surface agitator. I know that we are able to get away with more than not having any form of aeration; however, there is no 100% bullet-proof solution for every possible situation. If you go long enough without encontering problems, you can easily feel bullet-proof, over-confident, and more apt to push the envelope. Thanks again for your story, Donnie. You have jerked my leash and tightened my choke chain.