I had similar whacko pH numbers recently. Not my probe, no sir. Finally I checked the probe. When I calibrated it the previous time, I hadn't rinsed it off and when I pulled the lid off, I saw some of the blue high calibration fluid still in there. I felt dumb, but happy I'd solved my crazy pH numbers. I think the moral of my story is it never hurts to check.
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38 gallon Red Sea
Current Tank Info: 28g Nano Cube LED, AquaMaxx HOB 1, In Tank Media Basket, MP10, stock pumps, Apex Lite
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