Question about CO2 levels after water change

IME, all my tanks, stabilize within hours of a 50% water change.
This holds true with the 55s, right on down to the 5 gal.
I haven't tested for a while, but when I used to check, I was only losing approx. .2-.3pH after a water change. The fish seem to ignore this variance and as I said, it pops right back up in a short period of time.

Len
 
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