I had this same question a couple weeks ago and ended up adding a 2nd UTH on the cool side to bump the surface temps up from the low 70s. I was hoping this would "help" the ambient temps because I don't have the ability to add a ceramic light because it's a pvc enclosure. I "think I've seen a slight increase in ambient temps but it's still hovering around 77-78ish. Good luck!
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