Does this Hanna freshwater magnesium kit measure GH or just magnesium?
I'm about to pick this up to test my magnesium if it will work well for a typical planted tank. Does anyone know if this works and actually detects just magnesium and not gh?
I already have the api calcium test and have read that I can do some calculations to get the magnesium, but would this be more accurate?
What ppm of mg is required again? Is 2 ppm high enough (the hanna test range).