What can I do about low nightime ph?

Discussion in 'General Discussions and Advice' started by gaboon, 28 Mar 2010.

  1. gaboon

    gaboon

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    My nightime ph drops to 7.92 which I'm sure is causing unecessary stress. Daytiime ph gets to 8.3. I use a kalkstirrer and calcium reactor, calcium reactor is turned off at night. Sump is on a reverse cycle but that is not helping. I don't have any macro algae as I'm getting good results with carbon dosing (only dose in the morning). Do I need a ph buffer?
     
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  3. LuckyFish

    LuckyFish MASA Contributor

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    Where is your alkalinity? With carbon dosing it should be at least by 9.
    Is your skimmer in a closed cabinet together with the sump?
     
  4. gaboon

    gaboon Thread Starter

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    I Dropped the alk to between 7 and 8 while dosing vodka, would higher alk increase nightime ph? Skimmer is under tank, cabinet is not finished yet
     
  5. jacquesb

    jacquesb Retired Moderator

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    Gaboon - you can always dose your kalkwasser in the evenings, or perhaps even put a airpump and airstone in your sump in the nighttimes.

    And also of course - have your chaetomorpha's lighting period during the nighttime.

    This should all "correct" nighttime low pH values.

    BUT, as LuckyFish says - check that you don't perhaps have "too much" carbon-dioxide during the night times around your tank/skimmer/sump....
     
  6. gaboon

    gaboon Thread Starter

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    Kalkwasser is dosed via the ato which does not go on much at night with the fan off. I don't have Chaeto as it won't last with the carbon dosing.
     
  7. jacquesb

    jacquesb Retired Moderator

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    Ah ok Gaboon. Perhaps leave the fan on at nighttime as well? I mean - your corals need to "feed" on calcium 24x7 right? Not only in the daytime.....
     
  8. gaboon

    gaboon Thread Starter

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    Good point jacquesb, I'll try that. I've always had the fan on the same timer as the halides. Thanks
     
  9. mnd123

    mnd123

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    Gaboon, I had MAJOR pH swings because my alk was in the 4-5 range, would swing from 8.3 to 7.8 overnight.

    I got my Alk stable and now have a much smaller swing overnight (adding a reverse cycle light on the sump also helps keep the pH more stable)
     
  10. gaboon

    gaboon Thread Starter

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    Shot marc, going ro double check my alk tonight
     
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