we just got a bp (a few months ago) and started in a tank, but had the hardest time keeping the humidity high enough. We just switched to tubs ( got a boa this weekend) and the humidity is wiked good and the heat also. its also a lot easier to clean and is wiked open and the two snakes seem to like them.

Im no expert, but thats my 2 cents.

p.s we only have 2 tubs that are side by side an a single table, heated by flexwat.