Dkh

Discussion in 'General Discussions and Advice' started by Seabass, 24 Jul 2011.

  1. Seabass

    Seabass

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    Hi

    When you have some time available please explain how I can bring Dkh down. I would like it to stay at about 8. But advised as follows:

    "Pierre your dkh is to high for a LNS and you salinity to low, for your type of tank you should be aiming at a salinity of 1.025/6 and a dKH of 6.8 to 7"

    If I can get it to 6.8 - 7, that is a bonus.

    I have a mixed reef and run pellets, would like lowish nutrient system.

    23 July 2011

    Kh 9.3
    NO3 25 - 30
    PO4 <0.03
    Mg 1350
    Ca 400
    Ph 8.2
    SG 1,023
    Temp 26

    Thanks
     
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  3. Theo

    Theo

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    :confused1:
     
  4. mariusmeyer

    mariusmeyer

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    Stop all forms of carbonate dosing and just let it come down on its own. What is your daily alk uptake?
     
  5. Seabass

    Seabass Thread Starter

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    It is not that easy to stop all forms of carbonate dosing, I dose bio calcium, primarily for Calcium supplementation but it also increases Dkh. It contains hydrocarbonates.

    So my 5mg each evening keeps Ca at a rock solid 400, but Dkh increases.

    The lowest I have had it was 8dkh, and that was when I stopped dosing bio calcium, I cannot stop dosing the bio calcium supplement.

    So I am looking for a way to bring this level down and not stop dosing bio calcium, I have 20 kg of this.

    The extract below was taken from: Reef Chemistry Calculator

    DO NOT USE FOR INCREASING CALCIUM ONLY. IT IS A BALANCED ADDITIVE, IT WILL ADD 1 meq/lt OF ALKALINITY FOR EVERY 20 PPM OF CALCIUM. Add the powder slowly directly to a high flow area carful not to let it settle. The spoon of the 18 OZ container is 5 ml (or 1 teaspoon) and the one in the 4 and 10 pound containers is 10 ml (or 2 taspoons). It also contains hydrocarbonates so test your alkalinity also, Strontium, Molybdenum and trace elements. Do not dose all at once. Do not increase more than 20 ppm per day which will also increase alkalinity by 1 meq/lt. Dose 1/3 to 1/2 and the next day test. Check your levels and then dose another portion.
     
  6. Seabass

    Seabass Thread Starter

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    :) me 2
     
    Last edited: 25 Jul 2011
  7. mariusmeyer

    mariusmeyer

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    This is what I would do. Get a calcium only supplement and not a balance one. Then you use this to maintain the calcium while you allow the alk to drop. Once you get to the desired alk then continue with your bio calcium to maintain levels. Get a small calcium only supplement as you wont be using it for too long. Even a liquid one might help. As far as I know there is now supplement that will decrease alk.
     
    Last edited: 25 Jul 2011
  8. MavrickFDT

    MavrickFDT

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    :whistling: ....
     
  9. Seabass

    Seabass Thread Starter

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    Ok I have brightwells cal supplement, will switch till it comes down.
     
  10. Seabass

    Seabass Thread Starter

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    25/07/2011 @ 18h00
    Well, I went and bought some purple up. Stopped bio calcium, dosed 10 ml purple up, waited 1 hour and tested.

    8,6 dKH
    Ca 400 ppm
    Mg 1350 ppm

    So as long as dKH keeps dropping and Ca is stable I will use purple up.

    Shot for the info Marius.
     
  11. Kunhardt

    Kunhardt

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    Isnt purple up also a multi suppliment? Its called purple up for a reason...it adds all the elements needed to promote coraline growth.

    Just buy some Calcium Chloride powder from Finny its like R30 for a 500g tub.

    Better yet get a Calcium reactor it allows for easy adjustment of alk and Ca...okay maybe not easy in that you need to figure out how the reactor works first...but you know what I mean. :p
     
  12. mariusmeyer

    mariusmeyer

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    I thought you had the brightwells already? Why buy something else? You should have taken something like brightwells calcion or the seachem reef advantage calcium. Just check your parameters though. If the alk drops with using the purple up then its fine. I reckon it will drop but not as fast as it would have with a plain calcium supplement.
     
    Last edited: 26 Jul 2011
  13. Seabass

    Seabass Thread Starter

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    Will test this evening, but from what I read it does not increase alk.
     
  14. Seabass

    Seabass Thread Starter

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    Also bought turbo snail that did not make it so I took the purple up in it's place.
     
  15. Seabass

    Seabass Thread Starter

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    26/07/2011

    Ok, so this is bull crap. 9 dKH, Ca is 350 ppm and Mg 1350 ppm.

    So using calcion, brightwells, will see how it goes.
     
  16. herkie

    herkie R.I.P.

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    This makes me think of my friend S... find his signature and start learning about patience.;)
     
  17. Seabass

    Seabass Thread Starter

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    Who who who, ok that just sounds like an owl, S... ?

    You can see I am not patient.
     
  18. leslie hempel

    leslie hempel Moderator MASA Contributor

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    (chuckle) :tt2:
     
  19. Seabass

    Seabass Thread Starter

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    Been testing each day, Mg is the only reading that continues to drop. So I supplement this with Epsom salt / Magnesion on a regular basis.

    Calcium is at 460 now, have not dosed for 2 days as it is high.

    9 dKh for the past 2 days.
     
  20. Kunhardt

    Kunhardt

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    have u ever thought your tank just doesnt need as much as you dosing? In that your coral intake is not as much per day as you are replenishing per day.
     
  21. Seabass

    Seabass Thread Starter

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    Will keep on testing each night until I get a solution. Or something like a solution.

    Mark it looks like consumption is very low. As I dose the "balanced bio calcium" it appears the it maintains Ca, does not aid with Mg and keeps on pushing dKh up.

    Only time will tell, but it is not straight forward to get dKH, Ca and Mg to desired stable levels. Even with balanced and very expensive supplements.

    I don't think calcium reactor, dosing pumps will work for me if I cannot get manual dosing right.

    Will keep on trying :|
     
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