I have had my air pumps in my room for several cycles without any noticable effects on plant growth, I even called CCH2O to confirm this was ok when I purchased my UC systems. They gave the same rational about lifting them off the ground. If my room is sealed with 1500ppm CO2 and adequate air flow then isn't the whole room at 1500, not just the lower regions?
In theory this may be true, but in reality I think it is a myth...healthy plants don't lie...
In theory this may be true, but in reality I think it is a myth... I think there is a politician among us.jk