I have finally progressed beyond the DIY CO2 and hooked up a pressurized system. I hooked the line up to the needle valve and put the open end into the tank. I was getting 60 bubbles per minute. I have the line now connected to a Rena Micro Bubbler and have a nice fine mist of bubbles coming out. Is 60 bubbles per minute the norm. I have a 77g tank. Rick