Definitely get a thermostat. It may have to do with your room temps. I keep my room at about 80degrees (uncomfortable for me but idc lol) this way my tank remains at 85 ambient + a uth on the warm side (one bp is in a tub, I'll be switching the other over after some weight gain). If you're room is cold maybe you should use two uth's and set the one on the cool side about ten degrees lower. Granted, it's more expensive, but may eliminate the need for lamps. I don't use a lamp on my tank.
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