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just a couple questions. im adding co2 to my room and i will be using a controller 1. does my room have to be completely sealed to get the benefits of co2? or will i just be using bottles faster? 2. where is the best location for my co2 controller to get good readings?

im not exactly sure whats going on. canna coco/sunshine number 4 mix Fox Farm nutrients(big,grow,tiger) cal mag plus,superthrive