That pH is fine. Many reefers would prefer it to the lower values they have.
That said, do you know it is accurate? Almost all cases of pH too high (above 8.55) in the absence of limewater (kalkwasser) are measurement error.
What is the alkalinity? If it is not too high, then more aeration will bring the pH down a bit.
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Randy Holmes-Farley
Current Tank Info: 120 mixed reef
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