Another newbie question. All of you must just love us!!!!!

This question is for those whe use the Zoo Med Naturalistic Terrarium, 18in. x 18in. x 24in and removing excess water from the enclouser. Do you manually remove the water or has anyone drilled the glass to provide a access hole for a drainage line? I'm very interested in adding a drainage line since I would like to add a automatic mister.

Mike