Too much humidity will deplete the CO2 media fast, use the drop in PH more than the color change to figure out if the media is depleted or not.
How do I tell if I have too much humidity? There is no condensation in the actual scrubber since I added a box between the skimmer lid and first chamber.
Before that though, they would completely fill up with condensation and so much that there was water that would hit the media which obviously ruined it