Well, after a couple of months without my diffusers running, I can say that I have a lot of grass growing off the bottom, even in the 10' depths. My Film algae has returned as well. Water temps are at 61, on the surface. I hadn't thought about the diffuser helping to decompose the waste. I don't have an algae bloom, water is way too clear. Fish load is pretty heavy, too many white crappie, caught a few nice bass over the winter, 3 to 5 #'ers. Crappie are very thin.