Heat lamps will kill your humidity levels. I never use a heat lamp with Marius, I have only ever used a UTH set for 82F. These snakes actually are more comfortable in cooler temperatures, but they do need a moist/humid hide or two with which to retreat to if your enclosure is too dry. I use a couple of smaller tupperware tubs with an entry hole cut in the side and damp Sphagnum moss. If you do decide to use a heat lamp, be sure to provide the moss hides and don't stick them under the lamp (near the warm side is fine, but directly under will dry the moss out quickly and overheat the tub). In winter when it gets cold in my house, I often wrap a blanket around the warm side of Marius' enclosure and this keeps the ambient at a perfect level. Best of luck with your RB when you get it!
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