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Presuming all you test equipment is fine, you likely have some contamination from an outside source. I had a friend who had a similar issue and traced it back to a rag he used to wipe the top that his wife used (without his knowledge) to clean down the counter. She had cleaning solution on the rag. He accidently got it wet cleaning the top and contaminated the tank. In the end he did a complete water change out.
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