I don't know if you need the air to run 24/7 for the number of fish you have but as soon as our water temp is at 60*F we run the air 10pm to 10am. First this gets the air in the pond during the plankton crash over night because there is little to no light. Secondly it keeps the pond cooler with the cooler night time temps.

I did learn about our third year the running the air 24/7 would heat the pond even being 16 feet deep up to the air temps average. If you are seeing 90+ degree days your water temp will be that.

Our perch shut off eating after the water temp gets over 75. I am guessing they just don't need the energy at that temp.

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7/8th of an acre, Perch only pond, Ontario, Canada.