Judie, I have the same tank. The store in my town, (Omaha) has one that fits into the small hole in the back of the tank. I didn't see it online, but look around at shops, and you are sure to find something that will work for you.
answered 7 months ago
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I'm not using a heater and the tank seems to stay warm enough. I just keep the lights on underneath the tank.
answered 8 months ago
3out of 3found this answer helpful.