I need help. The lake temperature is 54 degrees on the top and 52 degrees on the bottom. This is in a 25.4 acre lake 20 foot depth with and average of 10 feet. Oxygen is good from top to bottom. I normally turn the 6 pumps on when the water temperature is 60 degrees at the top. I now have members wanting me to leave them off untill the oxygen is in just the top 6 feet of water. I think this is the wrong approach. What do you guys think?