I don't know how you guys do it with the little ones. I have two exo-terra terrariums. The Large 18x18x24 and the x-large 18x24x24 and I'm totally out of space! I got the plants to packed and ended up with a rot problem, even with two fans in the really big one.
Oops.
I've got the plastic mesh lining the back and sides to hang plants off of. Works well!