I want aeration, but don't know how much air to push. My pond scenario is 5 acres, a typical dam, bowl shape, backing up into a "tooth" formation. Only the bowl will contain deep water. Deepest water is 24' but only in the middle. The bowl is about 2 acres, the rest of the pond is 8' or less. I'm guessing that I only need to aerate the 2 acres of the deepest water, but how many cfm do I need to push ? I like the Gast 4 cfm pumps for their economic value. The kicker is that I can't run 24/7, it's solar powered and I'm limited to 8 hours a day run time per 1/4 hp aerator. Can anyone assist ? My fish sure would appreciate it \:\)