Bioactive enclosure for a rosy boa?

[freeflow246]

Hey all! I've lurked on here several times but figured I'd join because I've recently (within the past two hours) become interested in giving my rosy boa a bioactive enclosure. I found some instructions on how to make a bioactive vivarium, but they all seemed to be for reptiles or other animals that appreciate a lot of humidity. Rosies need to stay away from humidity so I was wondering if this would affect anything.

Some info (not sure if any of this matters):
She's currently in a 20 gallon tank with aspen bedding as substrate. A locking screen top. I probably give her about 2-3 inches of substrate to dig around in. She's about 30 inches long and 230 grams (she recently hit a growth spurt, that's why she's a little light compared to her length).

I upgraded my betta fish from a small 2.5 gallon to a natural planted 5 gallon a little less than a year ago and I'm loving it. I just realized the same principle can be applied to snakes. My questions are:

- can this be done in a 20 gallon tank? I might consider buying a different enclosure if I have to but I'd rather not.

- does the fact that rosies need to generally avoid a lot of humidity affect the setup at all?

- I'd like to stick with the environment her species came from cuz I think that would be neat. Is there a way to give the bioactive enclosure concept a desert spin? Any desert-y plants that would do well? Like succulents?

- I have a UTH permanently stuck to the bottom of the tank. Would that be adequate for heating?

- The tank is right by a window. If the drapes are left open, it gets about 30 mins of direct sunlight. Thadine actually likes it. Rest of the time there is plenty of natural light coming through the window, just not a strong, direct beam. Is this enough lighting for plants?

Thanks in advance!