Once you've gotten the pond broken in, I highly suggest you take temperature readings from top to bottom. If you can create a thermocline under your diffuser, great! If there is no thermocline, then once the top and bottom temps match or get real close, then you can back off on run time until those temp differences start getting bigger. What I'm saying is, why run your pump 24/7 if 6 hours gives you a complete turnover and saturates the pond with DO. The remaining 18 hours let's the depths cool and creates a deep, inhabitable haven from the heat and you're not overworking your pump, or burning electricity.
Elaborate? I thought the point of aeration was to NOT have thermocline?
