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  1. #1
    Senior Member tang_man_montreal's Avatar
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    Recent pH swings...

    Recently, my pH has been swinging more than usual, and it has me concerned.

    During the day, my pH is between 8.15 - 8.20, however, once the lights go out, it drops down to as low as 7.78. Nothing has changed recently, and I'm wondering why this would be? my pH during the winter was ranging from 8.4x down to 8.1x...

    Calcium is at 430
    dKH is at 11.8
    temp is at 80.8


    Anyone?
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  2. #2
    Senior Member reefmutt's Avatar
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    it looks more like your ph has just lowered a bit but the swing looks the same- maybe a little bigger. Tough call,.
    probe calibration?
    ageing sandbeds?
    changes in skimmer function
    magnesium levels?
    more fish?
    recent temp problems?
    change in additives--kw, different buffers?
    ...lets start there...
    Matt.

    Old system torn down to make a playroom.. planning a 62x42x28 high

  3. #3
    Senior Member tang_man_montreal's Avatar
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    I calibrated probes.... Still the same readings...
    Sandbed will be a year old in July.
    Changes in skimmer? In what way?
    Magnesium level... unknown.
    Fish... recently a Copperband and clam were added to the tank.
    Temp... averaging about 1.5 degrees warmer than during the winter at the moment.

    No change in additives. I only use Seachem Kalkwasser, however I have used Seachem ReefAdvantage Calcium and ReefBuilder when my levels were outta whack.
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  4. #4
    Senior Member reefmutt's Avatar
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    Could just be natural ageing..
    Is the same amount of kw going in the tank per 24hrs as in the winter?
    Your magnesium level may be low. Kw as a sole additive may lower it a little as it doesn't really get added, but is still being consumed- Mag was going in when you were dosing R.A. Calcium
    The temp may be activating the sand beds more than usual, maybe they are absorbing more oxygen.
    How's the clam doing BTW?
    Matt.

    Old system torn down to make a playroom.. planning a 62x42x28 high

  5. #5
    Senior Member tang_man_montreal's Avatar
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    The clam's doing great! Full mantle extension, and no longer gaping...

    I'm gonna keep a close eye on my pH... i'll get back to ya...
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  6. #6
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    How's your Nitrates? Clam doing anything for that yet??!!! (..... Hopeful thinking!!!).

  7. #7
    Senior Member tang_man_montreal's Avatar
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    I've noticed that my ORP has started to go up gradually... and this without any water changes...

    I think that maybe, a little, the clam is helping...
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  8. #8
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    do you have a refugium inline Vince? [I wouldn't know as you never ley us near your house ] because I found the reverse lighting kept things very stable.

  9. #9
    Senior Member tang_man_montreal's Avatar
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    LOL...
    You'll see the laboratory soon enough...

    I used to have a 'fuge online, and I will once again once at the new place.
    I am Homer of BORG... Prepare to be..OOOO!! DONUT!!!!!!

  10. #10
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    Vince, if your Ca is above 400, then your magnesium is probably OK. I couldn't get my Ca to stay above 400 when my Ca was low and Randy Holmes has written about the Mg and Ca link, as I'm sure you are aware of.

    I'm assuming that your calcareous algae has increased as well. As you are aware, an increase in algae will result in more CO2 being released during the night. The more CO2 the lower the pH. Could this be causing the dip?

    Vickie

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