I think that Holmes-Farley would probably suggest that this is just the result of overdosing both parts. Cut back on your dosing quantity, but continue to dose both parts. I think you will find the Alk falls, while the Ca doesn't move much.
You could try to manipulate the Ca/Alk separately, but I doubt that you need to in this case.
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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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