Yes they do fine with co2. I found I can crank my co2 up higher with my betta than other fish species without causing too much stress, and I'd believe that to be because of their ability to gulp air from the surface. As long as you don't have a tight fitting glass lid and have available oxygen at the water surface they do just fine.Simple question, are Betta fish suitable for a co2 tank? I literally can’t find anything online that’s straight to the point.
I know they have a Labyrinth Organ so I guess that’s the only difference to common fish
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I'd kinda disagree on this point - and here's why.But having an airstone should help the fish adjust during the early period when you first add the injection system. Actually it is a good idea to have an airstone even if you don't have CO2 injection.