I am also skeptical that it was oxygen that caused it, which is why I asked about the magnesium. I'm wondering if you caused a big change in magnesium when you did the 30% waterchange which then may have been the culprit...?
You did say that you just changed salt. Is this the first waterchange you've used it on? Maybe it's a dud pail...
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~ Mindy
SPS fanatic.
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