
That is a recessed area that allows for the exchange of air in european vivariums.Looks nice, from looking at the pictures I am confused. Is there a small "tank" on the front bottom of your tank?
I thought air exchange was an enemy to your humidityThat is a recessed area that allows for the exchange of air in european vivariums.
See:
http://www.dendroboard.com/forum/pa...tructing-euopean-type-vivarium-step-step.html
For details