Quote Originally Posted by AKA Reptiles View Post
As long as you have a proper gap between the top of the tub and the bottom of the shelf above each tub you should be fine as far as air circulation. I gap my tubs about 1/8" to provide decent air flow.
I do have about the same size gap but I guess my concern is that if I block off the back and part of the sides towards the back, that it will mess with airflow.