On my diy CO2 I made 2 days ago, I am wondering if I am getting enough out of it. I have a 20g planted tank and right now I'm at: 7pH, 4kH. The CO2 is at 12ppm. Do you think I should add another 2L bottle of diy CO2? I am getting about 3-4 bubbles/sec out of a air diffuser into a powerhead. That makes a real fine mist of the bubbles and they are extreamly small when they get to the surface. Should the CO2 bubles be totaly dissolved before they get to the surface of the tank? Oh yeah, does 17.9ppm kH= 1dkH ?