I have my cool side of my tank right around 80 degrees and my hot side at 90 with a UTH on that side as well since i figure if hes on that side he wants to warm up. The humidity is right at 50 which if i goes lower than that I mist his tank i have the new plant decor on the hot side at well and so far ive only observed this at night in fact this is the first time i saw it