Living in New York, I have extremely soft water, and need to supplement Calcium and Magnesium regularly. I am aiming for the recommended levels of roughly 7-8ppm Mg, and rougly 30ppm Ca.
What I need to know is whether the recommended 30ppm Ca is referring to straight Ca, or as calcium hardness as CaCO3? The Lamotte test measures it as CaCO3, and my tank reads 56ppm.
Does that mean that I have 56ppm Ca which is higher than recommended, or do I have 22ppm Ca which is lower than recommended?
Also, if I have 56ppm Ca as CaCO3, and 116ppm Gh as CaCO3, how much Magnesium does that give me? I am assuming that I have 60ppm Mg as CaCO3 which converts to 15ppm Mg. Is this correct?
Thanks for any info.