[otimer]

For your reference, i'm running a sodalime CO2 scubber, a reverse cycle iluminated small macro algae reactor and a Ca reactor. The daily swing of pH is about 8.05~8.25 just after the sodalime is replaced. I replace the sodalime when the lower end reaches 7.80.
While 5~7 visitors stay in my living room where the tank is located together with my 3 family members, it drops 0.15~0.20 within 2~4 hours during winter time due to the elevated CO2 in the room.
This is a bit better than those of the local reefers living in apartments.
The measurements are made by hanna hi 8424 regularly calibrated.