Thanks to everyone for your responses! I have a number of new variables to consider. I am going to get a thermometer and do some actual measuring, both at the top and at the bottom, to get a better handle on what I am actually dealing with temperature-wise. Let me also redefine my original question: If I only aerate part of the time (whether with solar by day or AC by night), is there still a benefit to the fish? Will the water stay oxygenated over the time that I am not aerating, such that it is still worth doing? I am trying to figure out if it is worth doing at all if I don't leave it on continuously.
