pH does not generally rise over time in aquaria unless you change what you are doing.
pH is determine ONLY by the CO2 level in the water and the alkalinity. Nothing else. So unless you change those somehow, pH won't continually rise.
I'd recalibrate the pH meter before worrying any further, and in any event, would not worry unless the pH got above pH 8.5.
If it does, more aeration will always tend to bring it down (but it won't if it is a faulty measurement).
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Randy Holmes-Farley
Current Tank Info: 120 mixed reef
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