Mg is the key to keeping Ca and dKH at their levels. the main tests to be done are those three. secondaries are NO3, PO4, Si, NO2. NH3,4 should be 0. other tests are the O2, B and Sr. I, IO3, really dont need to be tested if dosing or water changes are involved. i dont recommend dosing straight Sr, I or IO3.
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from what I understand is that when you test for Mg and KH, the Mg will be LOW and the KH will be high.
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every system is different. KH is carbonate hardness, dKH is degrees of carbonate hardness.
Mg is the buffer between Ca and dKH since Ca and dKH dont play nice together. the correct ratio is 10:5:.1 for Ca:dKH:Sr
a good place to start is
12-14 dKH with 8.0-8.2 pH and 450-500 Ca and 1320-1500 Mg with the temp 78-80 F at a salinity of 1.026
a safe place to start is
8-12 dKH with 8.0-8.4 pH and 420-450 ppm Ca and 1280-1320 Mg