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It's not good form to dose a ton, but there comes a point where it's better to shock things and get parameters in line vs. trying to be slow. That said, 1200 or so is low but not unreasonably so, so I would probably do it in at least a couple steps over a few days.

And my experience has been just throw in 200-300 mL every couple of months when I check, while Randy Holmes Farley seems to prefer 'don't bother even measuring' in many cases. At any rate, slow adjustment is probably always somewhat better, but may be a more conservative method of doing it. If your magnesium was 700 ppm, for example, raising it to 800, 900, 1000, 1100, 1200 over the course of a week or two would be far worse than raising to >1000 and then raising to 1300-1400 in two steps, imo.

I use red sea chemicals and I look I their little booklets regarding how much I can change in a day. But this on BRS regarding mag