I was wondering if I should leave the diffusers on all winter or not. The pond usually doesn't freeze for more than a week at a time. It has already snowed three times but I don't know what the current water temps are. There is alot of leaves in the pond from the surrounding trees. I've got redear sunfish in the pond and I understand that they don't tolorate cold that well. The diffusers are only 2 or 3 feet from the deepest part of the pond. Any input would be greatly appreciated.