Thanks fo the insight guy now what to do? As stated in the opening statement I was not aware until reading the forums that I should have a different defusser, move the defuser shalower in the winter,and not use dye to cut down on algea. Ido not have a lot of leaves and organic material being blowing into the pond. Making the pond deeper than 12 ft. is not a option. I plan to use two 9in fine bubble difusersright? placed in shallow water in the winter in 3 to 4 ft or 6 to 7ft? Not going to use pond dye, now whats the plan?