Randy Holmes-Farley
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My Tank Thread
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Nope, it does not. The only thing I can attribute it to is the AF salt. There was a thread going around where a user was getting readings in the 1600s I think on freshly mixed salt. I'm going to be mixing some to use on my fish QT and will check it to see what it is.
Likely from the salt, yes.
Real demand for magnesium is very low, and many mixes have excess magnesium to start with.