using 2 UTH heaters i have a 30g one on the hot side that is always on. it usually keeps the hot side between 90-96*F
and i have a small 10g UTH on the cold side that i only plug in if that side drops below 80*F which i don't thin kit ever does. the 30g UTH does a great job with the sand substrate. u can help regulate heat but adding or removing thickness of the substrate. i Know most don't like sand substrate but i have tried coconut husk, aspen, news paper and sand. and he seems to never go on the substrate unless its sand. he tends to stick to his vines, also he swallowed a piece of aspen once. and has not had an issue swallowing sand so i have decided to keep it this way. im thinking about removing the Heat lap and putting a florescent on a time so he gets a proper day night cycle. is that alright?