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If it's white, it's dead... If your water quality is good it will come back anyway. Purple up is just aragonite sand dissolved in water and is unlikely to speed up the process. The key seems to be calcium, alkalinity, magnesium and low phosphates.
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Some people say, "How can you live without knowing?" I do not know what they mean. I always live without knowing. That is easy. How you get to know is what I want to know. - Richard Feynman
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