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EI dosing & Calcium/Magnesium

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

  1. Pockets

    Pockets Prolific Poster

    Mar 13, 2007
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    9:15 AM
    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?


    * 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:


    Please help me if you can!

  2. Daniel Morris

    Daniel Morris Lifetime Charter Member
    Lifetime Member

    Feb 20, 2005
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    9:15 AM
    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:

    The second discusses more just the calculations of dosing:

    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

    Jan 23, 2005
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    9:15 AM
    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 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.

    Tom Barr

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