I dose Ca for 2 or 3 hours during the day, and Alk for 3 or 4 hours overnight. I manually dose Mg with my water change every 3 weeks.
I've had to increase the dose concentrations quite significantly over the last several months, esp the Alk. And now have to dose Mg as well, as that was getting pretty low now, too. I am sure it is all due to my SPS growth, as it is getting really crazy lately.
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