Tracy - sorry about the loss. My 2 cents it was not just or even mostly the aeration. More likely new water and cloudy skies for several days. Doubt it was heat related. With that short a run time increase and no whole pond turnover the HSB would have moved to the part of the pond where DO was higher. Probably running at to high a carrying capacity and whole pond low DO due to new water and cloudy skies. Could easily be wrong though - a guess.
I think you r on track Eric. I don't think it was heat related. It was more about lower DO in warmer water if we are talking bottom aeration and not looking at other influence's. I have seen it in my pond when I first started running aeration and checking DO. DO went down the warmer the water during the summer and running bottom diffusers. But I do think the increase in diffuser run time also had an influence, it's just that it happened at the same time the diffuser time was increased. I think "it was all the above" a combination of it all.
You know, if it were not for all the reading I've done along with the recommendations from the people that are supposed to know about bottom air , my 4 1/2 years of experience with bottom air i am not so sure it is the right thing to do. I really think surface aeration is more likely the best way to go, in my pond anyway. Half of my pond is 6 to 7' with an acre and a half of deeper 9 to 10'. Certain times of the year it will be a little deeper.
