I think you will find most people would agree your RODI values for Ca are not possible. Your tap water will have Ca removed from it by your RODI unit so will be lower concentration. Your tank, at 650ppm Ca is way too high, target for 410-440ppm if you are keeping corals. pH will take care of itself as long as your dKH is good, which should range from 8-12degrees. Many pH meters will not read accurately in RODI water, so don't get concerned if you see wonky readings. pH will range from 8-8.3 in SW depending on respiration levels in your tank, which fluctuate with your light cycles, but again, you have little to no control over this (alkalinity and ambient CO2 are what drive pH). I am assuming with a Ca level of 650 you do not have corals (I would expect they might not fair too well at this level), so why are you concerned about this stuff? FOWLR tanks needn't test for much more than salinity and nitrate, IMO.
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