for a 29 gallon I use the venturi intake on my powerhead.
It sucks the air into it, so at the surface it is negative pressure on the CO2 bottle, but at depth (too deep for the venturi affect) then the pressure from the bottle will produce a bubble and shoto it into the tank.
I guess I stay around 25 ppm on CO2 using the pH/KH calculation method, so it works for me. I DO have my system on the timer because I actually had too much CO2 in the AM before the lights came on (40-45 ppm)
It sucks the air into it, so at the surface it is negative pressure on the CO2 bottle, but at depth (too deep for the venturi affect) then the pressure from the bottle will produce a bubble and shoto it into the tank.
I guess I stay around 25 ppm on CO2 using the pH/KH calculation method, so it works for me. I DO have my system on the timer because I actually had too much CO2 in the AM before the lights came on (40-45 ppm)
