You are letting the pH of your display tank run your calcium reactor, which does not make any sense to me. It is not a tool designed to maintain pH....it is a tool designed to deliver Ca/Alk requirements. There is not a demand relationship between Ca/Alk and pH.
Here's how my reactor works... The pH probe is in the Ca Reactor chamber and the controller keeps that chamber at pH of 6.4 by adding Co2 when necessary. That is low enough to dissolve the media. The effluent from that reactor then goes through a 2nd stage where further reaction takes place. By the time the effluent comes out of the 2nd stage, the pH is up to 7.6. Optimally, it would be perfect if that effluent got back up to pH of 8.
I also have a pH probe in my display tank. It provides entertainment...but nothing else.
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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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