I add calcium, raise the hardness and add magnesium to my tank.
Calcium, I alternate between purple up and my LFS brand. Alkalinity and magnesium are both my LFS's brand.
I don't add much for magnesium, I found my salt has around 1300ppm for mg in it, so as long as I keep up with my water changes, I don't need to do much buffering with it.
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