This question has provided some interesting replies! Good one.
I run a Kalk reactor during night hours only, and run a Ca reactor continuously. Both are controlled with pH meters and peristaltic pumps linked to the controller. These supply all my Ca/KH requirements.
I test Alk once per week (unless I'm having some problems). Maybe test Ca monthly, but I generally assume it is linked to Alk. I might test Mg only every 3 months. I've never had to dose Mg, which I cannot explain.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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