Salt is Salt
I don't worry about the Calcium, Magnesium or Alk of the mix I use in water changes as I use a calcium reactor. There's nothing like aragonite calcium reactor media to suppliment your tank with the right balance of alk, Ca, Mg, Sr and other trace elements. Aragonite has these all in the right ratios (with the exception of alk) that occur naturally. I'm a big fan of calcium reactors to eliminate your dosing headaches.
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180 gal tank, 50 gal sump, PM RFCa6 Ca Reactor, SWC Extreme 250 1A Cone Skimmer, Tunz Osmolator ATOF, Aquacontroller Apex, Aquaillumination Sol Super Blue 6 x 75w Units, Acros/Softies/LPS/Mushrooms/Zoos, Purple/Powder Blue/Yellow Tang/3xBlue Chromis/2xTomato Clown/Lawnmower Blenny
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