Hmm...based on this conversation, I've just changed the pH of my reactor from 6.55 to 6.60. (I've been running a bit high on the Ca/Alk lately, so this is a way of turning the reactor "down" just a bit).
I have the same reactor....PM622. Mine has a 2nd stage added to it.
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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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