Vigorous aeration by your skimmer helps pH. Using a refugium with macro algae and lots of light on at night helps too. If you keep the alkalinity higher, then pH swings will be less too. Check your probe calibration and make sure there are no electrical current leaks in your system that may cause your probe reading to go off.
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180 gal tank, 50 gal sump, PM RFCa6 Ca Reactor, SWC Extreme 250 1A Cone Skimmer, Tunz Osmolator ATOF, Aquacontroller Apex, Aquaillumination Sol Super Blue 6 x 75w Units, Acros/Softies/LPS/Mushrooms/Zoos, Purple/Powder Blue/Yellow Tang/3xBlue Chromis/2xTomato Clown/Lawnmower Blenny
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