On the bottle of Purple up I think it tells you to maintain calcium levels to a particlar number which I do not recall. But as stated above you wanna be over 400, I think going with a calcium supplement is a good idea. I just switeched to Tailored Aquatics Calcium and DKH and so far I am very pleased with the results. I do also add Purple Up on the days I dose calcium and its been working real well for coraline and my SPS.
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