My pond is .75 acres and I have had aeration since we dug it close to 5 years ago. About 3 weeks ago my aerator quit running and it was the week before we left for a long family vacation. I had a lot to do before we left and decided to fix it when I got back. Well Thursday I changed out the capacator and it ran fine. When I first put it in I ran it 15 mins a day for a few days and then went to 30 mins for a few, and so on. Before it broke down I had it running from 10am to 2pm then 10pm to 2am on a timer. I didnt change that, it never even crossed my mind. So when I changed the capacator Thursday evening and saw that everything was working I left the timer set the way it had been. Friday I got home from work at around 11am and when I went to cut the frass I saw something floating in the pond. When I got closer I saw it was a bunch of big dead fish. I had nice nice bass 4-6 lbs floating, CC that were as big as my lower leg, and CNBG that were as big as my foot. We scooped them out and fed the buzzards. I see plenty of small bream and CC when the feeder goes off. I have to assume there are some small bass in there because the bass that I pulled out had to have spawned. Even if I wanted to add a few bass I couldnt because the fish truck has stopped running till fall. Lesson learned always restart aeration system slowely.