Calcium should be between 350 and 400 for good growth. Natural seawater is about 350ppm, and we keep it slightly higher just in case levels drop. I have always had awesome SPS growth with Ca around 390ppm. I have had my level higher, but did not see increased growth because of it. I keep my alk around 9-11 dKh, never concerned my self with Mg.
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Brad
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