I have been doing 2 part for about 5 months, and I have never added Magnesium. As a matter of fact, the Magnesium level goes up and down the same rate with Calcium.
By the way, I dose food grade Calcium Chloride ( Solvay brand ) and do 10% water change 1 or 2 times/month. I used to use Tropic Marin Pro Reef salt, then switched to ReefCrystal salt because of its lower Mg level. With tropic marin salt, my Mg level was always above 1500mo matter what the Ca level was.
I think I went off the topic a little bit. Sorry
By the way, I dose food grade Calcium Chloride ( Solvay brand ) and do 10% water change 1 or 2 times/month. I used to use Tropic Marin Pro Reef salt, then switched to ReefCrystal salt because of its lower Mg level. With tropic marin salt, my Mg level was always above 1500mo matter what the Ca level was.
I think I went off the topic a little bit. Sorry
