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Message: [QUOTE="MitchM, post: 151429, member: 4402"] I did put a heater in, but it doesn't really accomplish much. I'll plug it in every few days and it will open a hole to the water. All that happens is the air that the airstones are pumping in escape through there instead of finding their way out through the edges of the pond ice. I came across a thread somewhere that stated koi can live at a temperature of 58F for 4 months, no food with no ill effects.Darned if I can find it again. Maybe it was over on KKU. When I first put the temp probe in, it registered 39F, so that's probably what the actual temperature is. This is a first year pond with a very low fish load, so I'm not that worried about O2 depletion. I would still like to test for that, but it's a little difficult with a solid ice cover. [/QUOTE]