How tight is your pH swing? Tricks?

[KenRexford]

I have managed to get my pH swings to about 0.17 from average low of about 8.03 to average high of about 8.20. I think my total is a tad low because my pH probe is calibrating weird — older probe. More interested in the swing. My recent method is to start dosing two-part on the downslope, nothing at the bend and upslope. The reading is smooth up, hairy bumps down. A thing of beauty.

Our mutual goal is the unattainable (I think) net 0 swing. I don’t have my Fuge on a true reverse cycle because of Caulerpa naughtiness fear, but I do go darker somewhat in the upswing hours.
Any other tricks of the trade to recommend?

 

[arking_mark]

Normally 8.23 to 8.29, unless I leave my windows open...then I'm unable to control the highs with my setup.

Tuning a Skimmer / CO2 Scrubber for pH Control

On my reefing journey, I found Kalkwasse + Skimmer + CO2 Scrubber to be very effective for bringing my pH from 7.8 - 7.9 to 8.26 - 8.36. I guess most people would just leave it at that. However, I wanted to be more efficient with the CO2 scrubbing material so I wanted to implement a...

www.reef2reef.com

 

[Randy Holmes-Farley Verified Community Expert]

I do not think the daily pH swing is something that needs to be minimized (I'm not even sure it is optimal to have zero swing), but the more aeration you have, the lower the pH swing will be (assuming that air is not varying in CO2).