Moved DSB, PH spike???

Discussion in 'Water Parameters and Additives' started by RiaanP, 13 May 2011.

  1. RiaanP

    RiaanP Moderator

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    What happened?

    I replaced my sump. DSB area doubled up.

    I got "old" sand standing in a drum for 7 months. Little bit of water over it. Interesting thing is that there was 2 bristle worms still alive on this cold sand after all that time. But I could smell that faint rotten egg flavour, so I washed it out with tap water and a final rinse in RO water. Put this in the bottom 70 to 80mm of the new sump.

    Then I just scooped out my old DSB and placed it on top. Completely disturbing it. Used all the sand from the old DSB.

    Only parameter that changed, was the Nitrate. It shot up to 50, and a week later already down to 10. All other parameters are fine. No ammonia spike at all, was half expecting it.

    Only weird thing that happened, on day 4 after the move, the PH shot up from the "normal" 7.9 to 8.7.
    Day after the move up to day 3 it was the usual 7.9.
    Did a water change and that brought it down to 8.5.
    Next afternoon it was down to 8.3, the day there after 8.1 and then it stabilized back on its old level of 7.9.

    I can understand if my PH dropped. Like in immediately. But why up, and why 4 days after the move?
     
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  3. viper357

    viper357 Admin MASA Contributor

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    Not a good idea. Disturbing a DSB brings all sorts of nasties out, things like sulphur, phosphate, detritus and who knows what else into the water column. It would have been best to rinse that sand as well.
     
  4. RiaanP

    RiaanP Thread Starter Moderator

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    I do agree @viper357

    But I did not want to loose all the worms in there. And at the end, it did not affect anything other than the PH.

    And any acids forming in the bottom part of the old DSB, should surely affect the PH by dropping it. Not up.
     
    Last edited by a moderator: 26 Nov 2015
  5. Sentari

    Sentari

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    Riaan how did you replace the sand back into the sump.

    Do you fill it up with salt water then add the sand or did you put the sand in then put salt water in?
     
  6. Tony

    Tony

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    The moving of the DSB and the sediment being kicked up could have caused a drop in O2 causing p.H fluctuations
     
    Last edited: 13 May 2011
  7. dallasg

    dallasg Moderator MASA Contributor

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    what is your ALK?
    excess O2 and CO2 can cause fluctuations

    and i would say you need to get a PH buffer
     
  8. RiaanP

    RiaanP Thread Starter Moderator

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    Always first water, then drop in the sand. Using a milk jug. Else you trap air bubbles.

    4 days later? Will a drop in O2 raise or drop the PH

    My ALK is low. Always been low.
     
  9. RiaanP

    RiaanP Thread Starter Moderator

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    Tomorrow is 2 weeks after the move. I got no ill affects at all. Everything seems happy, not even the 7 pin cushion frags that is on small rock pieces on top of the DSB is sulking. They fully opened up from the next morning after the move.

    Was just intrigued as to why a PH spike 4 days later? Talked to Louis at Idol and he can explain a downward spike, not upward. Just something strange bothering me as to what and why.
     
  10. Tony

    Tony

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    I drop in O2 will cause a rise in |CO2 and a drop in p.H. I should have rad your problem more carefully. Having said that if your substrate was aragonite based the sediment kicked up in the transfer could have caused a p.H spike as it is pure calcium carbonate
     
  11. RiaanP

    RiaanP Thread Starter Moderator

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    that I can understand, but I'm using play sand.
     
  12. RiaanP

    RiaanP Thread Starter Moderator

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    Nobody else with a possible explanation?
     
  13. Tobes

    Tobes Retired Moderator

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