Michael,
I don't know if a Ca reactor does anything for raising Mg. You should have a test kit for it to make sure what your level is at. Having enough Mg is as important as having enough buffer and Ca.
As for phosphate, with your excellent lighting, skimmer and refugium, I doubt that you would measure any phosphate. I'm pretty sure that whatever phophate nutrients that would be produced in your reef, that whatever your skimmer isn't removing that they are being utilized by your macroalgae.
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