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Fluctuating PH in tap water

Discussion in 'Advance Water Quality' started by Lukass, Jan 11, 2016.

  1. Lukass

    Lukass Member

    Dec 6, 2015
    Cincinnati, OH
    When I bought a water test kit last month, I tested my cities tap and it read an 8.7 pH. From what I understand that is way to high for gold fish so I bought PH down.

    Yesterday I tested the tap water again and it is now reading 8.2. What would cause this change? Should I be worried?
    Last edited: Jan 11, 2016
  2. small_ranchu

    small_ranchu Admin Staff Member

    Nov 22, 2008
    Bergen, New Jersey
    Do not attempt to fix PH. 8.7 or 8.2 is perfectly fine for goldfish. Sudden PH change is a killer for goldfish. You need a stable PH.
    Lukass likes this.
  3. Fishheadz

    Fishheadz Well-Known Member

    Jul 31, 2014
    Moffat, CO.
    Stable pH is better than trying to adjust it up or down. Goldfish can live in slightly acidic(6.5), or slightly alkaline water (7.5-8.5, 9.0 would probablly be pushing it), however they do best in Neutral (7.0) water.
    Getting the water to 7.0 is not the goal. Keeping goldfish in what your water IS, is the goal. So, if your water comes out of the tap at 8.2, acclimate them to that, and keep them there, by not adding pH up or pH down, or proper pH products. As Fred mentioned, a sudden (and large enough) pH change, will kill your goldfish.

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