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Originally Posted by robbyville
My understanding is that PH should be higher prior to lights out than when the lights come on. Although I might have that backwards!
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Nope, you got it right! Coral/algae's absorb co2 during the day raising pH, they release it after the lights go out, in turn lowering the pH.
Never thought but do you have a fireplace or anything? It's possible now that I think about it that the room has a bit of Co2 built up from being sealed from the cold. Intersting...