CO2 distribution

Subject: CO2 distribution
> I have now hooked up the CO2 diffuser of my new 75 gal. to a CO2
> for the another planted tank. The problem is that the backpressu
> different between the two, and more CO2 goes to the 75gal than t
> I have now installed  Netafilm (or something like that) "dripper
> garden irrigation purposes (rated I think at 2l H2O/hour) on eac
> the CO2 line, with the hope that they would equalize the backpre
> between the two branches of the system. I had them handy, and th
> do the job. They seem also effective as check-valves (can anyone
> this?). I did not use two gang valves because I did not have the
> I though it might be difficult and time-consuming to find the ex
> that would equalize the pressure on the two CO2 lines.
> I would like to know if anyone has better ways to handle this pr

Air line gang valve don't work reliably either.  You need to 
cobble together a manifold using however many needle valves you 
need... one needle valve for each tank.  Anything less is playing 
with fire.

Karen Randall
Aquatic Gardeners Assoc.
Boston, MA