The Planted Tank Forum - View Single Post - Seachem matrix turns bright pink, what's wrong with my tank???
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post #7 of (permalink) Old 01-30-2013, 11:33 AM
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Join Date: Jun 2004
Location: Baton Rouge, LA
Posts: 3,349
Coincidentally, I just rebuilt a tank using a fresh bag of Flourite Black. If manganese leaching occurs, I figured brand new and dusty substrate should release an initial burst. So I tried your paper towel experiment:

The characteristic purple shade is almost certainly proof of manganese. I left it in for two days, and forgot to check on it in the meantime; but if I had, I'm pretty sure it would have been a lighter shade of pink.
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