CJ -- do you have good overhanging tree canopy? Any beaver ponds or similar features (lowhead dams) that open the canopy and slow (warm) the water? Anything to shade, speed up, and deepen water might make a couple of degrees difference for you and could be helpful? Just brainstorming. You probably thought of this stuff already?

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From Bob Lusk: Dr. Dave Willis passed away January 13, 2014. He continues to be a key part of our Pond Boss family...and always will be.