Pond Boss Forums AERATION Systems questions Moving diffuser in winter

Not really. The purpose of having the diffuser up off of the bottom is to allow the fish to have a warmer refuge (39 degree water) on the bottom. I put mine at 5' because that was the number that was between 1/2 and 1/3 the max depth of the pond.

With a pond that shallow, it will be difficult not to have the pond get too cold during the winter.

A pond that I monitored last winter had the deepest aerator left partially open, (by mistake) and the shallow aerator all the way open. The water temp at the bottom was 36 degrees. I was suprised that there wasn't any dead fish in the Spring. Not even the RES that were in the pond. But, the largest fish in the pond was only 7" that I know of.