After the mg is at normal level maybe use something cheap like calcium chloride (Turbo Calcium) and baked baking soda for adjusting alk and calcium levels.
I'm planning on trying the mg media in the reactor aswell but wonder if over dosing can become a problem. It would be a bummer if levels get too high and the need to dump all the media comes up. Possibly the easiest fix is to use a salt brand with the correct mg content and do some water changes. I find the bottled mg additives get too costly with larger tanks.
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