Anyone who answered the poll as "it never changes" has probably not measured it accurately enough to see what is actually happening. There is a 24 cycle based on the lighting and it is VERY unusual to find a way to hold pH steady throughout the 24hrs.
Here's a challenge...someone show me a 24hr graph with hourly readings of their tank pH that stays flat.
As for what to do about it. As mentioned, the answer is "don't worry about 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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