yes likely. I don't think you can go higher so some good advice on here. I would try doubling up and a moon light on continually to see if you can cover all area. maybe cover some of the area and angle a moonlight into it. I can see lots of heat being lost and is indicated that's why a lot of americans / Canada in colder areas in winter do use vivariums.....
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Horsfields, Spur Thighed, & Marginata
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