IME, the vast majority of tanks do not have issues with pH. The rpH ange of 7.8-8.3 is acceptable for most marine life, and the lower range is not uncommon for those who use calcium reactors.
Rather than concerning yourself with correcting the pH reading you got, I would be more concerned with minimizing the fluctuation in pH (which occurs overnight when your lights are off). Do you have a small light on your HOB refugium on a reverse-daylight schedule?
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I'm out. 
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