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Message: [QUOTE="mtpond, post: 240187, member: 3935"] I use an aerator in the winter and the defuser is 7 inches long so I have to pull it close to the top of the pond so it doesn't cool the bottom of the pond off so much. When my pond freezes over I still have at least a 2 foot opening. I keep a close eye on the temp of the bottom of my during the winter and since we had such a cold winter last year, when the bottom of the pond starting getting close to 32F I went and purchased a 1400 watt stock heater. Since the cords aren't very long I put it down as far as I could. It warmed the bottom of the pond up a couple degrees but raised my electric bill up a lot :(. My 12 koi and 1 goldfish all made it through the winter :)and so it was worth it for me. Scaring me that I read sissy posted where the almanac says this winter is going to be colder! Hoping that don't happen. [/QUOTE]