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Re: ph 6.4, kH 7.0 Whats going on?

>>>>> Colin Anderson <colin_d_anderson at hotmail_com> (here: "CA"),
>>>>> on Sat, 07 Nov 1998 23:15:50 PST,
>>>>> pondered the meaning of life, then wrote down:

    CA> Hi Aquatic Chemists:
    CA> I've been going through the FAQ's and other advice on the web and I 
    CA> can't believe the results.  My general water chemistry is as follows:

    CA> test    tap       tank
    CA> gh      22        18     dH      Red Sea Labs kit
    CA> kh      7         7      dH      Aquarium Pharm. kit
    CA> pH      7.4       6.4            Wardley kit

    CA> If I use the ph/kh/co2 charts on the krib I comes up with 70 ppm CO2.  
    CA> This seems like a toxic level to fish to me.  However, the fish are 
    CA> prospering and look great.  Also, this makes CO2 addition seem 
    CA> absolutely wrong.  Is there any ideas out there on what could be 
    CA> happening here.

Do you use a pH buffer like "PH Down" or peat?  That will change the pH 
independent of CO2.  You can't use the pH/KH/CO2 charts if you have peat or 
a pH buffer other than the "natural" carbonate buffer.

Carlos E. Munoz 
<cmunoz at crystal_cirrus.com>