QA, watched the video and had totally forgotten that I actually participated in that one and Bob even answered one of my questions at the time! Bottom line from that episode is that I am definitely on the precipice of a disaster if I don't change something soon. So, starting tomorrow I plan to go to a 9PM to 9AM schedule and see how that impacts DO and temps. Somehow I need to reestablish some sort of a thermocline and provide a cooler refuge area for them to escape to. From what they said in the video, it should only take a few days to do so. Will update as soon as I see some changes. Thanks again everyone for your input!!