Seem odd? Question

Discussion in 'pH' started by cichlidmac, Dec 28, 2012.

  1. cichlidmacWell Known MemberMember

    So I just tested my tap and aquarium water side by side which I normally do a few times a year. However these results are a little different than I remember. This time I wrote them down to confirm later.

    Tap= gh 53.7 ppm, kh 35.8 ppm, Ph 6.8 or 7.0 hard to tell, ammonia 0, nitrite 0, nitrate 0.

    Tank= gh 89.5 ppm, kh 53.7 ppm, Ph 6.8, ammonia 0 nitrite 0 nitrate 5.0 ppm.

    Is it common in a planted tank with no rock for the gh and kh to be higher than the tap? In this case I like the change but it seems odd?
  2. ryanrModeratorModerator Member

    CO2 would/could affect KH.

    GH could be fert's.

    And phosphates can play a part as well (IIRC).

    I think it's normal to see a variation. (Assuming of course, you let the tap water sit for 24 hours to reach equilibrium)

  3. cichlidmacWell Known MemberMember

    No I prime the water directly into the tank. Can't trust a bucket of water sitting around with toddlers.

  4. cichlidmacWell Known MemberMember

    Hmm maybe I should let some tap water sit for 24 hours in a cup and re test.

    After years of fish keeping I still feel like a noob sometimes :)
  5. ryanrModeratorModerator Member

    :) I meant the sample of tap water you tested. Did you let it sit?

    EDIT: :;nin2 there's my answer :giggle:
  6. cichlidmacWell Known MemberMember

  7. beginnerValued MemberMember

    several top offs in a row without a good water change will cause gh to climb
  8. cichlidmacWell Known MemberMember

    Did a 75 percent change a week ago.

    It seems I can't really have acidic water with a kh at 4. From what I've read so far when you raise kh it also raised Ph. I'm trying to keep my Amazon tank slightly acidic but I would like the safety of buffering.

    Choices, choices.
    Last edited by a moderator: Dec 28, 2012
  9. ryanrModeratorModerator Member

    Ahh yes, the old KH/pH relationship. You can not naturally raise KH without impacting pH. You can do it with commercial products though :)

    You have two options from Seachem (others will disagree with this approach):
    Mixing Discus Buffer with Neutral Regulator:  
    Mixing Acid Buffer with Alkaline Buffer:  

    The latter of the two (Acid/Alk) is a phosphate free method (I use these two for my planted tank)
  10. cichlidmacWell Known MemberMember

    Ryan, you da man
  11. ryanrModeratorModerator Member


    I use the Acid/Alk mix at the 1:2 ratio, I get a pH of around 7.2.
  12. cichlidmacWell Known MemberMember

    I may try discuss buffer to keep it acidic and still have a safe kh. Maybe I'll test it in a 10 gallon with some serpaes

    My new tank will be so much easier with the hi oxygen Zaire biotope.
    Last edited by a moderator: Dec 28, 2012

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