Thoroughly confused.
1. We WANT to disrupt the thermocline so that oxygen can enter the relatively anoxic waters below the thermocline. but...
2. we WANT a temperature refuge even if the O2 levels might be lower so we don't want to blend water to the point of no temperature difference.
3. We DON'T WANT quick water turnover or too much turnover as then we have superheated water
Is it possible to have a temperature refuge AND prevent the water that is cooler and nearer the bottom be too low in oxygen?
Here's the thing.
Your water will oxygenated to the depth of your diffusers, and the surface temperature will be there as well, because that's where the thermocline will be.
The depth below the diffuser, will have less oxygen and be cooler. Your fish will go there and enjoy the refuge from the heat periodically, but they will not stay there until they suffocate.
Putting the diffusers at the very deepest part of your pond takes that refuge away. And fish health will suffer as a result.
