For what its worth, in my experience I wouldn't try dosing any Ca or dkh until my Mg was closer to 1400-1450. Your Mg levels is what's going to determine how much of your Ca and dkh will stay in solution. In my tank if my Mg is below 1300 or so my Ca or dkh won't budge no matter how much I dose. Again, that's been my experience.
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