I guess I am still confused then.
Since my testkit says 85ppm GH, is there for sure a combination (regardless of what the % of Ca or % of Mg is) of Ca & Mg equal to 85ppm in the tank, or is it possible that the GH testkit is reading wrong (due to the CaCO3 reading you discussed above), thus making the actual Ca/Mg combo less than 85ppm?
If I wanted to start dosing 36ppm GH, utilizing Gypsum and Epsom Salt, should I just base the dosage amount on what shows up on the Fertilator (already takes into account the divisions of 2.5 and 4.1, for Ca and Mg, respectively), to add up to 36ppm (probably 27ppm Ca and 9ppm Mg)? Thus, totally ignoring the new reading of GH on my testkit, and just knowing that my new GH is 36ppm greater?
Hope this makes sense. I would like to avoid buying a Lamotte Ca testkit. I guess it is not essential anyway.
450g Planted Discus Tank - Work in Process!