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#1
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![]() Like how low? Under 7 dKH? That will cause bleaching and STN.
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#2
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![]() Yes it was around 6.2 dKH. Then with a water change, it raised the Alk levels higher (more than 1.5 dKH that day).
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#3
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![]() That's a big swing, but that would take a big waterchange of much higher dKH to get that much swing.
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