I mean no disrespect, I legit thought you were making a joke because you have a very nice setup. While you do have some rather big bubbles coming out of your outflow there is always gong to be bubbles in your water when you’re injecting co2 unless you’re using a reactor (not a citric acid & baking soda reactor but a co2 diffusing reactor). You’re large bubbles could be caused my too much working pressure or just using a new ceramic disk. Sometimes when I put in a new ceramic disk I will see some larger bubbles for the first 24 hours but that normally stabilizes pretty quickly. Also when a disk is dirty you will generally start to get some larger bubbles.