Join Date: Jul 2011
Location: Fayetteville, PA
Okay - so I got a pH controller that I am planning on using with my CO2 pressurized system, and I have noticed something interesting.... and yes my pH is a bit high - still trying to figure that out, but...
During the day, my pH is around 7.71-7.77
However, during the night my pH rises to 7.85-7.89
This confuses me - I understand that plants release CO2 at night, but wouldn't that "lower" my pH not raise it? So if that is true what would cause the pH to rise during night time - or when my lights go off?