Low PH due to high CO2

[nuj244]

Anyone experienced sudden drop in PH due to high CO2? Nowadays that most of the windows and doors are closed due to haze, there is a tendency of CO2 build-up causing low PH. My ph dropped from 8.3 to 7.9. How about yours?

[solasido]

I also suspect the haze cause some of my SPS losing color although not yet stn, because nothing is changed including water changes, salt, water parameters, etc. It only started few days ago in the morning was okay but in the evening after came home from work I notice sudden lose of color/pale just in a day.

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