I just recently added an additional pH probe to begin monitoring my tank pH. Here's a shot of the daily cycle that the tank is currently experiencing.
My immediate thought is that this is a pretty high pH to be reaching (8.8)!! I have only just recalibrated the sensor, so I'm pretty sure this is accurate. I'm going to ask for pH advice on the other forum...
Now that I'm monitoring the pH, the plan is to add a Kalk reactor and run the Ca reator and Kalk reactor on opposite cycles to try to minimize the pH swing.
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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