The Planted Tank Forum - View Single Post - Ca:Mg ratio question
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post #4 of (permalink) Old 01-25-2013, 02:36 PM
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Pogostemon Helferi melted for me when hardness was low, less than 2<dgh, however most of my other plants loved the low hardness. if you really want Pogostemon Helferi to do any better i would aim for 3-5dgh.

far as Ca Mg ratio goes, i would aim for 3:1 or 4:1, most people keep Ca around 30ppm and Mg around 6-8ppm
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