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Results 1 to 8 of 8
  1. #1

    Join Date
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    Default What is raising my pH?


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    I've just cycled my new tank. I tested the parameters, and ammonia and nitrite are 0 and nitrates were about 5ppm. I also tested pH and it was 8.2. I tested my tap water ph however and it comes out as 7.5. Any idea why my tank's pH is much higher?

    The fish in there stills seem pretty happy right now, and I know that fish can acclimate to changes as long as they are gradual, but I'd like to gain some insight on what is possibly raising the levels. Thanks!

  2. #2

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    Do you have any limestone rocks in your tank?

    Those would raise the PH.

    If not, I'd suggest next drawing some tap water and letting it sit for awhile and see if there is a change in the ph. It may be that from the tap it isn't buffered very well and so the ph would be less stable.

  3. #3

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    Maybe its from my substrate? I read that crushed coral could increase pH? Should I change it?

  4. #4

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    Crushed coral and slate will raise pH. Change it if you're not planning on stocking alkaline-loving fish.
    "Somewhere, something incredible is waiting to be known." Carl Sagan

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  5. #5

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    Quote Originally Posted by FishkeeperFenix View Post
    Maybe its from my substrate? I read that crushed coral could increase pH? Should I change it?
    :) it causes PH to skyrocket to 8, 8.5. It's used in marine tanks just for that. So... you're looking at a rebuild.

  6. #6

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    +1 to the above posts

    Crushed coral will leach out calcium (and other minerals) when used in fresh water aquariums which will cause you pH to climb. Same thing applies to marine substrates when used in freshwater tanks.

    I would suggest changing your substrate as well

    Just make sure you don't put your fish though drastic pH swings through the process
    If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
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  7. #7

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    Also, reading up on the chemistry of ph and buffers might be time well spend.

  8. #8

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    What kind of fish do you have? For instance, if you have an African cichlid tank, that ph is actually good.


    55g African Cichlid tank -
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