I'm a little confused about something... I ordered a rack which is arriving soon, and already have the flexwatt and helix thermostat ready to go. My only question is, do I need an Acu-rite thermometer for EVERY tub? I will have 7-8 snakes total, and wanted to check before I buy anything else - I own 4 Acu-rites (or the equivalent) currently, but two are still in the box & can be returned. I was also thinking of getting a temp gun, especially if that can take the place of Acu-rites. They are just such a hassle, not to mention an extra expense with each snake.