I was reading back at the beginning of this thread & you mentioned using 2 CHE's- that's too much for a 20 L tank. You can also 'insulate' the sides & back of this tank. If you want scenery, tape it on first, & insulate behind it- you can use various things- corrugated cardboard, foam board, poster board (foam core), cork (sheet or tiles), etc etc.- to help keep warmth in. You also started off saying the room is 70* w/ space heater, so there's a big difference too. Everything matters, just keep tweaking things to get what you need, & bear in mind that everyone's situation is a little different, so there isn't one exact formula we can give you; BPs are not the easiest snakes to accommodate, fyi.With higher heat, there goes the humidity, all too easily.
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