I have a 30G & 10G for my Quarantines.
Its set up just like you explained.
I control the CHE & Heat Mat with Dimmers from LOWES. ($14.99). I use a Probe thermometer over the glass where UTH is (under substrate) and have the thermometer it self on the other end for ambiant & Humidity of cool side. I use a 60 watt which has me at 78-82 and the UTH at 88-90. Humidty is 55% as i use Duraplex Plexy glass over the screens from lowes and Cardboard around 3 sides along with a Dish Towel over the top to help insulate the Plexy.
If you divide your enclosure (more like the size of 10G's ) you'll only be running those dimmers 3/4 throttle with a 60 watt depending on your room temps. Its a great way not to spend $195 on a Herpstat 2 for now which is what I run for my Display Enclosures with RHP & UTH.
PS- your idea about the Uth Split is what most do with a T8 with a divider. Works fine. Put it right in the middle for each side to share (use 1 Dimmer for it) then run 2 heat CHE's on the cool sides for ambient ove the water
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