How to read the Ca/Mg reading of GH
I just bought a Calcium testkit to find out how much Mg I actually have.
GH - 7 dGH x 17.9 = 125ppm
Ca - 60ppm
so Mg must be ~65ppm
I have no real clue if this is a lot of Mg or not, but what is the expected range in PPM for Mg?
Another question... while using the Ca testkit, it says the color will go from pink to purple to finally blue when seeing how many drops it takes to reach your Ca level. the chart shows this very dark shade of blue that I never reach. It does however change to pink after the first drop, purple after the second, and then a lighter blue on the third drop (20ppm per drop). Should I assume the sign of Blue at all means it is done going through the color-changing process? I am using the Aqua Pharmaceuticals brand.
450g Planted Discus Tank - Work in Process!