Why is my Mg always so low?

[Coleus]

Originally Posted by fishytime

Try using this http://www.reeftime.com/reef-chemistry-calculator.asp ....it will tell you what you need to dose of each chemical to get your parameters balanced

I have a question about the calculator and dosing mag.

Let's say my tank is 180 gallon in total (main + sump) and i am using Sea Chem Magnesium Advance and I would like to raise from 1300 to 1400

The calculator says the amount i need is 171 tsps; 855 grms; 30.15 oz


So, do i pour this whole amount into 10% of freshwater change or directly into the tank? Raising 100ppm per day is safe right?

Thanks

[e46er]

Don't forever to account for sand and water rock displacement