One thing you don't want to do is wait till your levels are off to add anything Cal. or Alk. or mag. You need to detemin your demand. I have settled in with 1 cup of 2 part calc. and alk. daily and 1 cup of mag 2 part twice a month. If I add some corals then I'll begin monitoring these levels and adjusting upward as needed. You should add calc. and alk. daily to keep it stable.
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