Mine rises from nightly low of 8.0 to around 8.25 by the end of the daylight cycle. Kalk reactor starts immediately upon lights out. I can always tell when the Kalk in my reactor is depleted because the nightly low goes below pH 8. That happens between 10 days and 14 days.
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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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