20 gallon brazilian boa question

[Ballpython2]

how long can a brazilian rainbow boa live in a 20 gallon tank? I think mine is still a baby/juvenile, not really sure at this length

[qiksilver]

How well does the tank hold humidity? Because it won't live long if it doesn't.
Individual snakes have different growth curves. One of my brazilians shed once a week, and grew maybe a foot in less than a year.

[Ballpython2]

How well does the tank hold humidity? Because it won't live long if it doesn't.
Individual snakes have different growth curves. One of my brazilians shed once a week, and grew maybe a foot in less than a year.

it holds it well, I have the cypress mulch as the substrate, I have a humidifer which is always going, and I have a humid hide in there also.

So there is NO way it will die do to not enough humidity.

ALso, I was told I could put saran wrap or tin foil over the screen thats correct right? its one of those or something