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Originally Posted by rrkss
This makes fine tuning my bubble rate much more difficult is there some specific reason to why I need higher pressure? One more question, my tank reads 750 psi. Is this about normal since I expected it to be 1000+ PSI.
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CO2 tank pressure will be around 800 psi at 70 degrees F. The pressure will vary with temperature. When you start to run out of CO2, the liquid in the tank will be gone and the pressure will start to drop - that's the time to refill the tank.
I found that I needed about 25 psi from the regulator to maintain a steady bubble rate, when I used a ceramic disc diffuser. The diffuser and the check valve both take some pressure to allow CO2 to flow, so if the regulated pressure is too low the bubble rate tends to surge and drop, surge and drop, and sometimes just stop. With the setup you have a lower pressure might be ok.