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Thread: stuborn PH

  1. #1
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    stuborn PH

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    I have a ph problem here, would welcome any suggestions.

    I am using a juwell rekord 120. 120 litres tank. 1 30W light with reflector. base fert is dennerle dupoint mix 120. some substrate from sam's pet shop. dunno what brand (no corals). CO2 injection via ceramic diffuser bowl. gh5 kh5 ph7.5. lights on 10 hr per day. ph seems to stay at 7.5 and not drop. have 2 SAEs, 2 golden algae eater, 2 clown loach and 1 fish (those you use to feed louhan) inside and some shrimps. Any suggestion as to why PH stays at 7.5?

    Regards
    Robin
    i always fighting algae but still got more

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    What are you using to test the pH? A pH test pen or a chemical test kit?

    If you're using a test pen, have you calibrated it? What's the bps of your CO2? Did you measure the water before injecting CO2? Any diff?
    Vincent - AQ is for everyone, but not for 'u' and 'mi'.
    Why use punctuation? See what a difference it makes:
    A woman, without her man, is nothing.
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  3. #3
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    Yes, please confirm that the pH tester is working properly. You could test it with a baking soda solution.

    What is your CO2 injection rate?
    Cheers!!

    Sherwin Choo
    [email protected]

  4. #4
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    Forgive my ignorance but how to test with baking soda?

    I inject co2 at 3 bubbles per second.

    Regards
    Robin
    i always fighting algae but still got more

  5. #5
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    dissolve some baking soda in luke warm water or just water & dip your PH test pen into it.. if your PH test pen shows a diffi reading it means its working... after testing it with soda... re-calibrate your PH test pen with a PH 7.0 buffer solution that comes with it when u bought it... or u can buy from any LFS for a big bottle with can las u up to quite a long time

  6. #6
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    Means same thing for my longterm PH indicator?
    empty the measuring solution, put it in baking soda "tank" and see change.
    then change liquid and put back in original tank?
    i always fighting algae but still got more

  7. #7
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    Long term pH indicator? Errr... personally, I wouldn't depend on those.
    Vincent - AQ is for everyone, but not for 'u' and 'mi'.
    Why use punctuation? See what a difference it makes:
    A woman, without her man, is nothing.
    A woman: without her, man is nothing.

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    I think it is more like a CO2 indicator. If you need pH of the water, use a pH test kit instead.

    BC

  9. #9
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    thanks a lot, just wondering what kind of test kits you guys use

    Robin
    i always fighting algae but still got more

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    Any test kits from the LFS should do the job. Personally, I use Sera kit.

    It is a very simple test. You just add the specified number of drops of the indicator into a water sample. After that, you match the resultant colour with the colour chart provide to obtain the pH value.

    BC

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    I'm not extremely sure, does the Rekor20 come with an internal overflow system? I know some Juwel tanks do... if so, the splashing from your overflow might be outgassing your CO2, and as such you will never see a ph shift.
    Allen

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    my filter has an internal overflow sys.
    but co2 is doing fine, plants producing bubbles etc.

    Robin
    i always fighting algae but still got more

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    ----------------
    some substrate from sam's pet shop. dunno what brand (no corals
    ----------------
    Hi Robin, your kH is already 5 dkH. Are you adding baking soda to maintain at this level? If not, then something in the tank is contributing to this.

    Just as a test, can you take a small sample of the substrate and put it in a cup of water. Let it stand over a few days or week. Then test the pH. Just suspecting the higher pH is from the substrate since you are not too sure of the contents. Test the kH as well.
    koah fong
    Juggler's tanks

  14. #14
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    the substrate is fine and i add sera kh-up sparingly. My ph is going down now . still dunno why maybe because i changed to using a cp2 reactor instead of diffuser

    robin
    i always fighting algae but still got more

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    "kH-up" could be alkaline stuff like baking soda. Can test with your pH test kit. So the pH went up when you add that into your tank.

    Just a test (not again!): add a drop of kh-up to a sample of water and then test with your pH test kit.

    Let us know.... cheers!
    koah fong
    Juggler's tanks

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    Thanks! I think you may be right, the sera KH up powder is slightly akaline

    Regards
    Robin
    i always fighting algae but still got more

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    I have stopped adding sera KH up powder but today after I change 30% water, I observed some other stange results from testing.

    PH of tap water 6.5 has gone up to 7.
    Also Tap water which is almost KH 0 after adding to tank with original KH 7 stays there, no drop in KH.

    I am pretty sure nothing in my tank causes KH up.
    could it be my filter?
    I am using internal Juwell filter with 2 thick blue square sponges and 1 thick black square sponge. in addition there is a thin cotton layer.

    Any comments?
    i always fighting algae but still got more

  18. #18
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    need some response.
    i always fighting algae but still got more

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    If you have post previously:"I am pretty sure nothing in my tank causes KH up.", I really do not know what else to comment.

    As already mentioned, KH rising is very straight forward.

    1. Something is releasing carbonates.
    2. Buffers has been added.

    Nothing mysterious about KH, other than a crappy KH tester.

    BC

  20. #20
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    Robin,

    Test your gravel, as suggested by Juggler above. If may not have coral, but there could be other substances in it that can raise KH.
    Vincent - AQ is for everyone, but not for 'u' and 'mi'.
    Why use punctuation? See what a difference it makes:
    A woman, without her man, is nothing.
    A woman: without her, man is nothing.

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