I finally got my regulator and fire extinguisher (CO2 tank). But I'm not
sure what bubble count to shoot for? I gather 3 bubbles per second is a good
start. My reactor (Hagen) is quite inefficient at the moment, so I'll need
to use more CO2 until I can replace it.

I also noticed that it's difficult to get good flow control from the needle
(JBJ combo) valve. It sort of an all or nothing deal. What working pressure
should I use? I having trouble getting less than 50 PSI.