mseepman, I am at a loss to offer an explanation.
There is no mechanics that I can think of that would allow Ca/Alk to go UP beyond the levels of the replacement SW in any system that is supporting SPS and coraline algae.
I don't think that fish or overall bioload are a factor as they don't pull Ca from the water.
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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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