Chasing Alk

140 gallon DT with a 75 gallon sump. Coraline taking off well and 7 or 8 sps mini colonies or frags. 62 ml of alk per day with kalk reactor running from top off.
 
Magnesium?
Mine has creeped down to about 1200. My friend "borrowed" my magnesium solution a few months ago to use a bit and I haven't seen it since. I need to break down and get some Epsom salts to make some more (Wal-Mart only had the scented kind when I looked the other day).
 
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