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Thread: PH

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  1. Default PH

    0 Not allowed!
    I'm running pure R/O water in my newly established Discus tank. The R/O water tests at 6.5 however after having the tank set up for a week my PH is at 7.4 What raised the PH and how do I safely lower it and maintain it?

  2. Default

    0 Not allowed!
    You can't use pure R/O water in a Discus tank or any tank for that mater.. it's rising because it has no buffering capacity. You either need to reconstitute the R/O water with trace elements or find a ratio of R/O water and tap water to achieve your desired level. Without trace elements you will end up with a lot of dead expensive fish.

  3. Default

    0 Not allowed!
    Would black water extract work?

  4. Default

    0 Not allowed!
    I would use Kent R/O right, I've read mixed reviews on black water extract but are you trying to breed Discus? They usually adapt to a wide range of water parameters, you may not need to use R/O at all once your tap water is stable.

  5. Default

    0 Not allowed!
    Yes I am going to breed them eventually. Thats why I would like to maintain a PH of 6.5 My PH straight out of the Tap is 7.6

  6. #6


    0 Not allowed!
    Quote Originally Posted by mojosodope
    I would use Kent R/O right,
    I'm sorry I was not very clear on my last post. This was the additive I was referring to. There are some discus keepers in our local aquarium society that swear by this product when used with pure water containing 0 tds
    If you take your time to do the research FIRST, you can successfully set-up and keep ANY type of aquarium with ease.
    "Not using a quarantine tank is like playing Russian roulette. Nobody wins the game, some people just get to play longer than others." - Anthony Calfo
    Fishless Cycle Cycling with Fish Marine Aquarium Info [URL=""]

  7. Default

    0 Not allowed!
    Black water extract is more used to mix with tap water than R/O water, it lowers your ph,gh,kh. Keep in mind that your R/O water is basically a blank slate, I'm not sure how the extract would work in such a situation but Kent R/O right is a proven additive. Like Cliff said, many Discus owners/breeders who use R/O water swear by it.

  8. Default

    0 Not allowed!
    Recommendations by the Supplier:
    Discus need crystal clear,clean water.Weekly partial water changes will be necessary. We recommend pure R/O water with deionization.
    Keep the PH around 6.5
    Temperature should be around 84. Breeding Discus should be kept at 88 degrees.
    Soft water is needed. We recommend Black Water Extract.
    Discus need lots of oxygen, so keep an outside filter and inside aeration sponge filter. We also highly recommend a UV Sterilizer. Ideally we recommend 1-micron filtration

  9. Default

    0 Not allowed!
    Did you buy wilds?, based on those requirements that is what is usually needed for keeping wild discus.

    The temperature is right on, most people keep them 82-85 degrees, then raise them higher for treatment or breeding.

  10. Default

    0 Not allowed!
    No. They are not wild.

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