I'm very surprised by the Alk. However, that mixture is not too helpful in how much of it does what, you know. Anyway, not to worry. Let it come down on its own.
Before you do a water change, I would bring the new water up to 1400 magnesium. Do water changes with newly prepared salt water that is reading near 1400 Magnesium.
That is the only adjustment to do at the current time. Let all the other numbers settle and come down naturally. There is another way forward, if you want:
Do a 50% water change. But don't throw out the 'used water.' Hold it. The water you add back in should be new salt water that has magnesium at 1400 ppm. The water you hold off to the side will be used to raise the alkalinity in the future. This is not such a great idea though. The water you are 'holding' has a shelf life of only about a couple of weeks (stored in a container that doesn't let any light in). This holding suggestion is really more useful in a running aquarium where the alkalinity is being depleted routinely. Since yours isn't and may not ever get to that stage, this isn't such a useful approach. But it is one which would more likely end up you dumping the water on hold.
It should be noted though that you were relatively very accurate. You were accurate in measuring out the Epsom salts; you were accurate in estimating the volume of water in your system; and you were accurate in measuring the magnesium level. It would be hard to do one or more of these things wrong and still come out right. So the odds are that you did all this correctly.



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