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EI dosing & Calcium/Magnesium

Discussion in 'CO2 Enrichment' started by Pockets, May 31, 2007.

  1. Pockets

    Pockets Prolific Poster

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    I am using the EI dosing method on my 135gal tank. Water volume is about 120gallons so I enter that amount in Nutri-Calc for a general EI dosing recommendation.

    My question is about Calcium & Magnesium dosing

    I dose the following

    CASO4 - Calcium Sulfate
    MGSO4 - Magnesium Sulfate​


    Can someone please look at the snapshot of my Nutri-Calc setup and comment on if my Ca/Mg dosing is too little or too much?

    Important

    * my "20ppm" of Calcium is the result taken from Nutrafin test kit and is in CA2+ "total calcium" level. The level of Carbonate Hardness in CaCO3 according to the instructions is gotten from multiplying CA2+ X 2.5 = 50ppm in CaCO3.

    I am confused about whether or not Nutri-Calc is expecting me to put my "Source PPM" as CA2+ ... OR ... CaCO3 ... :confused:

    [​IMG]


    Please help me if you can!


    Thanks
     
  2. Daniel Morris

    Daniel Morris Lifetime Charter Member
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    Pockets - i can't answer your question directly re Nutri-Calc, but alternatively I wanted to show you two very educational links I just recently found.

    The first discusses the relationship between Magnesium and Calcium and what you should/shouldn't be worried about, and also some dosing calcs:
    http://www.aquaticplantcentral.com/forumapc/science-aquatic-fertilizing/9519-calcium-magnesium-relationship.html

    The second discusses more just the calculations of dosing:
    http://www.aquaticplantcentral.com/forumapc/general-aquarium-plants-discussions/10973-help-calculating-correct-dosage-cacl2-mgso4.html


    I know that doesn't directly answer your questions, but I hope you can find them useful.
     
  3. Tom Barr

    Tom Barr Founder
    Staff Member Administrator

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    Yea, good old Edward, claims things, never seems to try them. Claims other methods, ranges and rates are bad merely because he is unable to achieve success. It's not a method's fault, it's your fault.


    I tried inducing the Mg+ with R wallichii, at 20ppm of so and low Ca, around 10ppm, the R wallichii still grew quite nicely.........so it's it what he claimed?
    I do not see how it can be that solely.
    Or Mg/Ca blocking.

    We really do not see that nor have evidence of that in an aquatic water column system. That is the system that matters.

    I really start to question folks when I repeat their claimed ranges.rates and cannot reproduce them.

    Shalu's explaination is best.

    For CaSO4*2H2O and MgSO4*7H2O, just shoot for about 3:1 ratio Ca:Mg, and about 1-2 degrees extra GH booster or about 15ppm:5ppm.

    That's plenty of Ca/Mg for aquatic plants for a week and does not include other potential sources such as fish waste/CaCO3 rock/Tapwater/TMG etc.

    Regards,
    Tom Barr
     
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