Thanks bblinks for doing all the test and posting your resalt.
I think testing your tank weekly and dosing daily or weekly is the best way to go. I have been using DD H2O for about a year with my daily water change, witch is about 1% of my volume.
I think I'm going to go with IO because I aready add KH, Ca, and Mg, to my mix.
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120 G sps reef, looking to build bigger. 
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