Hi,
You can test the high CO2 content theory by taking a sample of water and placing it in a well ventilated area. Wait 8 to 24 hours and remeasure pH. Most of the CO2 should have dissappated in to the air by 24 hours (just like stale pop).
Oh...I would check if the pH test is wonky by measuring the pH of a freshly mixed saltwater.
When was the pH measured? (right after the lights turned on, when the lights are off, and etc).
Hope that helps and good luck.
- Victor.
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