Mine drops to 8.1 overnight and then climbs to 8.4 during the day. I have checked my calibration numerous times and maintain a steady temperature.
I have read that having a fuge with lighting on in reverse of the display tank can stabilize the pH. On the other hand, my SPS, LPS and fish are very happy and healthy. I've come to ingore pH and concentrate on alkalinity.
The only thing worse than having a pH meter is having 2 pH meters. They will never agree and can drive you batty.
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