Congrats! Set up a thermometer/hydrometer so you can keep track of ambent temp in the enclosure. If the UTH is doing a good job providing the correct ambient temperature, then maybe you don't need a RHP. Otherwise you can add one to make sure your new BP had the right temps.
Personally, I only run RHPs in my terrariums and that works out very well for me. You just have to figure out what works for you and your BP.
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