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Sorry to confuse, I meant in terms of algae.. coralline is the main Ca user.Stony corals absolutely use calcium and after things start to take off, in much larger quantities than the coralline algae. Calcium consumption is about 18-20 ppm for each 1 meq/L or 2.8 dKH of alkalinity.
IMO, the best method for SPS tank dosing is to start off with Kalkwasser in ATO. It will help stabilize Ca, Alk, and PH all at once. As your corals begin to get bigger and are consuming more. Then start dosing 2-part to keep Ca and Alk more stable.

