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I’m just talking out of my arse here, but a protein skimmer just basically pours a ton of air through a lot of small bubbles, right? This causes the proteins in the water to make a foam that gets captured in a cup.

Assuming I got that right, then the answer is… maybe. I can’t find the source right now, but I remember reading that you can only dissolve a max of about 4ppm CO2 through atmospheric exchange, and typical tanks have about 2ppm. We only typically see the 4ppm point hit in very large, fast flowing streams (which your protein skimmer would never be able to replicate). The bottom line, is that you could add *some* CO2 to your water, but not enough to be meaningful.
 
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