I know a tub is going to be the recommendation however I'm hoping someone can give me advice on keeping boa's in glass (at least until he's up in size). I have a exo terra 36x18x18 and I would like to put my newly acquired 9mos old bci in. I live in Colorado where our humidity is low so I know keeping humidity up is going to be a problem. Any suggestions on combating this? This exo terra has a screen lid so I'm guessing I need to figure out a way to seal this off. After that, are there substrates that would help more than others?
When he gets bigger I plan on getting a large pvc enclosure which I'm guessing will help with the humidity problem.

Thank you so much for taking the time!