Advice on huge pH swings

[Randy Holmes-Farley Verified Community Expert]

Please do let me know! Would love to know what you think! I have a lot of surface agitation and my feeling is that at night with the very high levels of CO2 in the living room it equalizes quickly and the pH drops. During the day as I aerate the living room and CO2 levels drop to normal (450-500ppm) levels the pH quicky rises... But these are just my observations.

if you have cyclic CO2 levels in the air that match the light cycle, that could partly explain the issue.

why does your living room have high CO2 at night? Do people sleep in it?