I've been wondering this off and on for a while, but I plan to get a rack in the next few months so I thought I should ask. How do people with a rack usually keep tabs on their humidity? Do they just have a hygrometer in one of the tubs in each rack? I can't imagine some with 20 snakes or more have a hygrometer for each snake, I never see one in the videos or pictures I see of peoples snake rooms.