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  1. We are after as many aquarium plant images that we can get, doing so will assist us in completing the aquarium plant database.

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GH test - calcium and Magnesium

Discussion in 'Aquatic Plant Fertilization' started by Davejt, Mar 14, 2010.

  1. Davejt

    Davejt Junior Poster

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    Is it possible to have a positive GH reading (Say 4-8dKH range) and still be limited on either calcium or magnesium? Do another minerals contribute to a GH reading? How foolproof are the GH test kits... i.e. API. I usually dbl the sample size to get to .5 accuracy.

    Put another way, do both Ca and Mg have to be present to show a reading? or can just one drive the dKH up on the test.

    Thanks
     
  2. nipat

    nipat Guru Class Expert

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    Yes, hence the suggestion of adding GH Booster to raise your GH up 1-2 degrees.
    To guarantee you don't lack either one.

    You can try it yourself, put MgSO4 or CaSO4 to distilled water and measure.
     
  3. jonny_ftm

    jonny_ftm Guru Class Expert

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    GH is the sum of Ca and Mg. So, you can have only Ca but not enough Mg, yet GH will be high
    Often, tap water is poor in Mg and GH is mainly Ca in it
     
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