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jamescook;202238 wrote:
calcium at 15 drops on the api test
That's only 300ppm. Each drop = 20ppm of calcium.
Below 380ppm there aren't enough ions of calcium in the water to be useful to coral. Your dKH of 12 may be the reason your Ca is that low. Check your magnesium and maintain it at a level of 1300ppm to be able maintain proper calcium and carbonate levels.