Visions aren't really an option for me since I don't live in the states, but I do know Jeff Clark houses his BRB's in them and covers most of the back vent. There is still cross-ventilation from the space in doors I am told.
I would strongly discourage you from purchasing another tank. They are absolutely unsuitable for this species, as well as most other snakes. It is impossible to maintain any cross-ventilation in a tank, but it is ok if you keep the top complelety open, as enough air can be exchanged for a healthy environment... however you cannot maintain elevated humidity levels by this. You now must block off the top, and by doing this you block off the ventilation. Stagnant air is not beneficial!! It also creates a prime environment for spores to thrive in.
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