Get a KH test kit (carbonate hardness). If that's low, inder 3 degrees,
you could have PH swing problems. Especially as your yeast CO2 reactor
changes it's output as it ages.

Most PH stabilizers are usually just baking soda in a bottle. If your KH
is low, you can slowly change it by adding a little baking soda with
your water change water.


Rodman wrote:

Hey guys. I just purchased two Hagen CO2 Yeast units for my 40 gallon tank.
I know that introducing CO2 into the tank will cause the pH to lower,
however, is there a way to keep it stable? I know Hagen recommends to use
their pH stabilizer they sell in order to keep the pH stable. Has anyone
had any success with this? I just don't want the pH to swing around
possibly huring my fish. I really don't care though, if I can get a stable
low pH around 6.5-7.0. The fish can get used to that, I just want it to be
stable...

Thanks

Rodman

--
Sherry Michael Weller
SAS Distributed Desktop Support
www.psych.upenn.edu/~sherrym