Excess Co2 cause low P.H and high GH?

Discussion in 'Aquarium Water' started by DNA, Mar 22, 2012.

  1. DNANew MemberMember

    Hi all!
    Just had a couple of questions.

    Last night, i noticed i have slighty lower PH, and a higher GH.

    Does anyone have any experience with this being directly related to excess Co2?

  2. toosie

    toosieWell Known MemberMember

    Welcome to Fishlore!

    CO2 will lower pH and quite often we will aim to lower our pH by one degree when using CO2. For instance... if the tanks natural pH (which may be different than your tap pH because of several different factors) starts out at 7.6 we may aim to disolve enough CO2 into the water to bring the pH down to 6.6 This gives us about 30ppm CO2 in the water. While CO2 does affect pH, it does not affect GH. If your GH is getting higher then it could be due to the type of substrate you are using or shells or rocks you may be using for decoration.

    If your GH is increasing, your KH may also be increasing which could cause the pH of your tank to be higher than it normally would be. To check what the natural pH of the tank is without CO2, put some of the water from the tank into a container and run a bubbler in it for 24 hours to disperse the CO2, then test the pH. If you are using CO2 it is important to know what the natural pH of the tank is so that you can avoid over dosing. If you don't have a bubbler you can run in it, leave the container uncovered for a few days, then test it.
  3. iZaO JnrWell Known MemberMember

    +1... great info

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