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In this episode of our series, Mr. Saltwater Tank - Raw, Uncut, and First Impressions (RUF), Mark will look at the Marine Magnesium Checker from Hanna Instruments. Join us as we run a blind test on Mark's tank with this checker - we'll show you how easy it is to use, what we like about it, and discuss how often we'd use it to test magnesium in our tank.
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