verdehoy, OK we just spoke on the phone and you have my 2 cents. I was curious as to those temps so I went out and probed a few. I have been running a larger system in a smaller pond then yours. 11.2 cfm to 5 stations in a 1.2 acre 9 ft average depth pond.Running large system for last two weeks to get Rex's Blues nice and warm and to gass off the sulfer and precipitate out the iron in my makeup water. I normally run a 2.5 cfm and two station system.In the top ft between two diffusers I am 86.1 F and at 13 ft (bottom is 14ft)I am 82.2F and 89% saturation or 6.9 ppm DO. Your system in 1.75 acres with a deeper average and a 4.4 cfm compressor to 3 stations should not have your temps the same from top to bottom.Be sure to check your thermometer.I think with cutting the feed back (or out) for now and shutting down the deep unit and also slowing down the other two as we discussed will lower your temps without giving up DO.
