Its a two stage reactor, so it probably isn't affecting the tank as much as might be expected....and I'm only running the reactor at 6.8.
My Ca/Alk demand is such that I could turn the reactor up....based on the current pH, I think I'll drop the reactor pH a bit and see if that causes any affect upon it.
There is a good chance that the 48" x 72" surface area, as well as two sumps (18" x 36" & 24" x 48") might be contributing to better-than-usual gas exchange.
I also think that I can see the effect of glas cleaning in the daily fluctuation. When the glas is cleaned, the cycle is slightly lower. As the glas greens up, the cycle gets higher.
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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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