Of course, it could be something related to the Ca/Alk that your specific tank uses. It think it is fairly accurate to say that both Kalk and Ca reactors deliver both Ca/Alk in a mostly balanced way.
Holmes-Farley also says that often having one of these parameters a bit low is an indication of not enough of the balanced Kalk or Reactor...as opposed to concluding that you need to chase Ca or Alk separately.
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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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