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Testing pH levels with meth blue

Faran
in Beginners Corner

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K, I'm Xferring water from a large tank to a small tank for growing out some fry. The large tank needed an overhaul so I did a big clean and I'm ready to fill it up again.... but the water I've saved has meth blue and I'm not sure how to check the pH to try and match it with the new water. Any ideas? Thanks in advance.

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