help with co2
I have been injecting co2 for about 5 months now. I have a ph controller/monitor that has always read 7.6 ph with co2 off at night and I would drop the ph to 6.6 during lighted times.This would give me 30PPm. Now I added 2 pieces of driftwood that I soaked for 6 weeks before adding. Doesnt appear to be releasing any tannins anymore . BUT ! Since adding the driftwood, my ph is 7.0 with lights off period and I lower it to 6.3. Dont know if I am getting the 30ppm I was before adding the wood. How do I tell my co2 PPM now , with the wood altering my ph.