Another silly ph question

ChrisfromBrick

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Yes I know, we shouldn't be chasing ph. But, I cannot help but look at it when im checking my neptune during the day.

here is the issue (if you want to call it an issue):

I open co2 scrub (not recirculate) for ph boost as my tank is in basement. These past 2 days the weather has been so nice in NJ that I opened all the windows. In the spring, this typically ran my ph up to 8.32-8.40. Recently, it has not cracked 8.15 with a very strong breeze and nobody home. I am thinking it could be a few things.

-co2 scrubber media exhausted because its old and sitting in a very large 5 gallon bucket although always sealed
-ph probe has gone bad (less than a year old)
-ph probe not submerged enough? Its about halfway submerged and never saw dry air
- used chemi clean 2 weeks ago. Would this have any influence on ph? Alkalinity is stable and steady.
- skimmer overflowed for an entire 2 weeks after chemi clean. Wondering if this had an effect on the co2 scrubber.

I know it doesnt matter that much but I dont like ph dropping to 7.8 at night. It used to never go below 8.0 when scrubbing.
 
Could be any of those except the probe submersion question and the bad probe is unlikely if it calibrates.
 

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