I just got my new rack done. I have never used a rack before so this all new to me. I am using 11" heat tape and a Herpstat thermostat. What I need to know is what is the best way to monitor the temps and humidity in the tubs? Do you have to have a ther/hydrom in each tub?? Should I use digital ones or dial kind? Anybody with info I would appreciate it...oh, and where do i place it all in/out of the tub? Thanks!1