how do ph and kh affect co2 levels???

[aquatrippe]

Excellent links.. thanks...

I read somewere...on some aquarium site that PH changes upward are less stressful on fish than downward.. can't imagine why that is true.. but will read these pages linked..thanks

 

[isaac newton]

Ok this is what i got.. I dont know my Kh I dont have a kit and i asked the lady at petco if they had one, they dont.. So they only gave me a ph test... Here is what i have in my tank.. I have a 10 gallon tank with onyx sand substrate... Its about 1.5 inches thick from the bottom of my tank.. I tested the water.. One is a tap sample and the other is tank water... My tap water is at 7.9.. My tank water is about 7.2... What is the buffering power of onyx sand?