Check your nitrates. If they're high, then you've got too many fish. Two things are important for raising pH - aeration in your skimmer and lighting. The more of either, the higher the pH. Higher alkalinity will increase the lower limit of the pH swings.
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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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