If your alk levels are stable (supported by the Kalk), then you probably don't need to be adding Ca separately. Kalk will supply both. When your Alk starts falling, it is usually an indication that you need to increase supply of both Ca/Alk.
You are likely overdosing Ca at the moment.
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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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