Quote Originally Posted by MarkS
Do you have a lidless rack system? You'd be surprised how much air you can get in the tub with as little as an 1/8" gap between the top of the tub and the bottom of the shelf above it.
I have a Boaphile rack system and it is made w/ only .050 ( less than 1/16 of an inch) all way around the top of each tub and the air flow seems good. And they seem to have enough air, no bad smells linger and the humidity stays good.

I didn't think it was enough air at first but it seems to be working out fine.

A lot depends on the room conditions where the tub is at.