Thanks again to everyone helping me out.
Visited the LFS. They measured Mg for me using Salifert:
Frag tank: 1350
Display tank: 1380
My measurements with RedSea on same water sample:
Frag tank: 1800
Display tank: 1600
So looks like Mg is spot on. So RedSea test kit found its way to the trash. Its interesting because I had another LFS verify my Mg and they used a Redsea kit and also showed a high reading of like 1550.
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