Interesting topics. The issue of water changes and their effect on Ca, KH, Mg, and Sr (and other trace elements) is interesting. My interpretation tells me that a)water changes are necessary; and b) they're not enough. So, relying on the gospel of reefkeeping (don't supplement for what you don't test for), I'm left in a quandary.
I don't like the tedious tests we're already doing for Ca, KH, PH, temperature, salinity, NO2, NO3, and NH3. Adding additional tests for consumables like Mg, and Sr doesn't seem like much fun, and even so, there's still the acummulating stuff (Fe, Cu, sulfates, phosphates) which apparently need monitoring too.
What's a poor (and getting poorer) boy to do? Hire a lab technician and go long on chemical stocks?
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