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I do, but only cause I'm lazy... and its FREAKING COLD OUT THERE!!!
And as far as heaters are concerned, it is actually best to keep it on all the time. High loads followed by no loads are what stress heating elements and lead to premature failure. Nearly without exception, electrical devises run longer and more efficient with a balanced, constant work load. Which is why I chose not to use a fish tank heater, as the ones I saw kept the water to warm. I was not sure, but it seemed to me that a bucket, kept at +/- 50* in a -20* environment could have a pretty significant evaporation loss. Definitely less than a bucket at 35*.