I started injecting CO2 a little over a week ago. Approximately how long does it take your CO2 levels to return to baseline after a 50% water change? Thanks!
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.