Join Date: Sep 2009
Location: New Smyrna Beach, FL
This can depend on the diffuser and how long the CO2 is in contact with water prior to entering the tank. With a good inline diffuser put low on the outflow tubing, you may not see any bubbles at all.
That being said, I liked the Atomic diffusers when I ran an in-tank diffuser. They seemed to do a good job of creating a fine mist that dissolved quickly.
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75 gallon planted in progress Radion XR15FW x 2 w/Reeflink Fluval G6