I have used that salt as well and found the same problem with the Mg levels. For what its worth, I have not found much better results with any salt brand including TMP. I got a bunch of Mg suppliment from ChemMaster, and just add to the tank as needed.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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