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16ppm Nitrate tap water



Hi all!
Finally I've got Lamotte NO3 and PO4 kits and Seachem's Iron kit.
But, NO3 kit saids my tab water is 16ppm NO3.(3.7Nitrate-N)
I mean I can't remove Nitrate from my aquarium by waterchange.
What am I suppose to do?
Is this tap water O.K for waterplanting?

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   Hong, Sungmin  (S.Korea)
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