My lights and CO2 come on at 10am each day, which is long after I've left for work. Each day when I get home, I find the tubing to my diffuser has been blown loose. I've been in the room when it's happened on the weekends. I will hear a pop and see that the tubing has been knocked loose due to pressure from the CO2 tank. I've had this happen with a check valve and without. My best guess is water is backing up through the diffuser, which is only a few weeks old, and that the pressure from the tank isn't strong enough to overcome the weight of the water. If this is so, how do I counter it?