Well...generally speaking, you can't bring Ca DOWN...you can only bring both Ca/Alk down, then try to rebalance by adding whichever one ends up low.
So if you think you are too high (which could be debatable), slow your reactor down just a bit and wait. Both Ca and Alk should fall. If the Alk ends up low, you can dose a bit of baking soda to adjust.
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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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