Not trying to specifically contradict anybody, but the slightest disturbance of the placement of that aerator could change the whole dynamic of something that's probably already working extremely well.
It has crossed my mind more than once that the silt may actually be benefitting Dave because it's inhibiting light penetration, which in turn is probably supressing the algae growth. Keep in mind that fish don't die from a slight increase in silt suspension. I personally wouldn't touch the aerator or the aeration schedule.
IMHO, a microphytic or macrophytic crash is the only thing that will kill these fish, short of a near complete loss of water. And if that happens there ain't nuthin' that's gonna save 'em anyways.
