Since my reactor days, I have added magnesium, { following Ben,s formula}, to my IO salt mix. Thats kept mine over 1350ppm, usually just over 1400ppm. I,m currently trying some Seachem salt, that has higher mag levels.
When I ran my co2 reactor, found the same results as Tony using Carib Sea ARM. Levels always stayed up, so it must give a decent amount of magnesium also.
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Doug
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