Ahh thanks very much george, that is fantastic, atm I am getting about 60 bubbles per min via DIY and I keep it fairly constant due to changing over a bottle weekly. But I also unfortunatly run 24/7 do to the DIY nature and not wanting to uncap at night and recap in the morning. That is why I am really looking forward to pressurized, being able to kill the flow at night when my plants are pumping out co2 on there own. That and the steady rate and less work hehe. I am also toying with a ph controller on the solenoid, but just may use a timer to stop the flow at night for the time being. As to not freek the wife out cost wise hehe.
I don't really have a ph crash problem atm anyway. My tap water is pretty steady 7.2 to 7.3 and when I added peat to my substrate and started blasting co2 I only fell to about 7.0 to 7.2 so almost perfect for my cherry reds, neutral to slight alkaline. As anything I read said cherries prefer that range. And so far they are happy and healty but have not breed yet, (well that I know of hehe, I tend not to even see the adults for periods at a time). Sometimes I see them out cleaning like mad, others they vansish for periods, not sure if that is due to molts or what, but they always seem to come back out. I see my japonicas alot more, they seem to be alot more active shrimp, and are out cleaning non stop.