You probably should have included Kalk in your poll...
I run a Ca reactor, but unlike most I have removed all the weaknesses in the system. Flow through the reactor is controlled by peristaltic pump and CO2 is controlled by pH probe and controller.
I also use Kalk in a Kalkreactor. It goes in only at night to help stabilize pH, but also contributes to Ca/Alk. Like my Ca Reactor, it is controlled by peristaltic pumps and monitored by pH.
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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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