I have just started using a Blichman Conical fementer and It seems that I am not getting the bubbles that I got using the 6 gallon glass fermenter. I was so worried I took the lid off and it was definitely bubbling the same as when I could see it in the glass fermenter. I am getting good attenuation in a couple of days as it should but it just seems weird. The lid has a valve that I guess keeps 3psi of pressure in the tank as when I lift it you can hear the pressure release. It seems that even with the valve that the gas will escape through the airlock and not build preassure. What am I missing?