Alk drop without live stock?

Discussion in 'Reef Chemistry by Randy Holmes-Farley' started by Kevinkmk, Jan 2, 2018.

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  1. Kevinkmk

    Kevinkmk Active Member

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    hi everyone,

    I just recently upgrade my old tank to a 91 gallon tank. The new tank is currently running 3 days with only live rocks. However, my alk has drop from 9.9 to 8.5 in three days with only live rocks. I’m wondering is it something normal? Currently I’m running BRS GFO and carbon (using recommend 1.4 cup GFO and 0.4 cup carbon), and protein skimmer. Is it because of the GFO? Any tips would help. Thank you!

    Tank parameter
    Cal 450
    Alk 8.5
    Mag 1500
    Po4 0.04
    No3 2
     
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  2. Kevinkmk

    Kevinkmk Active Member

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    anyone?
     
  3. cracker

    cracker Valuable Member R2R Supporter R2R Excellence Award Build Thread Contributor

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    I'm curious also, here's a bump
     
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  4. Kevinkmk

    Kevinkmk Active Member

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    Bump
     
  5. nautical_nathaniel

    nautical_nathaniel Indecision may or may not be my problem. R2R Supporter R2R Excellence Award Reef Squad Leader Article Contributor Build Thread Contributor

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    How stable has it been since it dropped?
     
  6. Crabs Mcjones

    Crabs Mcjones Tank Mechanic R2R Supporter R2R Excellence Award Reef Squad Leader Reef Tank 365 Article Contributor Build Thread Contributor Partner Member 2018

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    It could be from the GFO, I've read elsewhere that GFO can cause calcium carbonate precipitation, which can effect calcium and alk levels. Have you tested your calcium levels ( i know its unlikely at this point as you have no corals) But that might be the cause.
     
  7. Kevinkmk

    Kevinkmk Active Member

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    The t
    The tank has just recently been setup from my old tank. So I do not have any data. My old tank is pretty stable.
     
  8. Kevinkmk

    Kevinkmk Active Member

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    I do have test all parameters. The calcium is the same, alk has drop, and mag has increase.
     
  9. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    It is normal for their to be abiotic precipitation in reef aquaria that are almost always supersaturated with calcium carbonate (as is normal seawater). It happens in new salt mix containers as well. :)

    Iron on the GFO and iron released to the water can accelerate it, as will lack of organic matter.
     
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  10. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    You would be unable to detect reliably the calcium decline associated with a 1.4 dKH alk drop (being about 9 ppm).

    The magnesium rise is just testing error.
     
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  11. Kevinkmk

    Kevinkmk Active Member

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    Thank Randy! Will it keep dropping or is there way to make it stable?
     
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  12. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    The drop will typically go slower and slower as alk drops.
     
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  13. Kevinkmk

    Kevinkmk Active Member

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    Does it mean if I want to keep my alk at 9, I will have to be dosing 0.5 alk (same amount for calcium) everyday to keep it stable? Assuming I do not want it to drop
     
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  14. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    Quite possibly, yes. Until you get creatures in it, I'd let it free fall and only boost it back once you have something in it that cares (a hard coral, etc.)...
     
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  15. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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  16. Kevinkmk

    Kevinkmk Active Member

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    So after I add livestock (ie fish and snail) the alk wont drop that much? I’m planning to put corals in but I will quariteen my fishes for 30 days before add them back into the dt. So having only corals inside the tank, Will GFO remove the alk like what I’m currently having? Thanks
     
  17. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    It might be faster or slower. :D

    GFO is not removing alkalinity. It can, however, accelerate precipitation of calcium carbonate.
     
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  18. Kevinkmk

    Kevinkmk Active Member

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    Thanks
     
  19. Kevinkmk

    Kevinkmk Active Member

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    You are correct! My salinity has drop to 1.023 from1.025 during two weeks. There is white salt precipatate in my sump. Any idea how can I fix this? Thanks
     
  20. Randy Holmes-Farley

    Randy Holmes-Farley Reef Chemist Staff Member Team R2R R2R Supporter R2R Excellence Award Article Contributor Expert Contributor

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    You are not dosing anything in that area?
     
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