I've had high Mg levels before (way higher than the 1500 the kit maxed out at) without any problems. But the high Alk and low Ca could be part of the problem esp if you have new stuff that isn't acclimated to those levels (and I'm talking long term here not just the acclimation to your tank). Sometimes RTN can trigger a cascade effect and cause RTN in other colonies that have been in your tank for awhile. Try to get the alk back on track and the other levels should fall in line with water changes with new/better salt.
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