I have a small heater/fan under the floor. I put it right next to the steps above the belly skin. When it dasterdly cold, I plug it in to keep tanks from freezing and belly warm. I bought the best one I could find, and the safest...tip over switch..and it keeps the floors warm, and tanks and lines thawed out. If you just want to keep tanks thawed, keep it on the lowest setting. I use the 500 watt setting on low temperature. I screwed the heater to a nonflamable piece of bakelight. You can buy bakelite at hardware stores. It's dark brown.
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