See those bubbles on the surface of the water? Check the PH when they are there and when they are not. The sun will swing the PH on you quite a bit during the day. I can't remember 100% but I think the PH is the lowest it will be when you have the bubbles on the surface. Heck my air stations would make big 1.5" bubbles that would stay first thing in the morning for 8-10 feet from the station.

If your getting the PH swing the pond is working. Air stations can mix up the clay and make things murky too.

Cheers Don.

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