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I have an Eheim oxygen diffuser on the output of one of my 2217's on my 125g mbuna tank (for increased circulation/aeration), would anyone know if it would help to increase dissolved CO2 in my low-tech 55? (no CO2 injection)
 

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Air is composed of roughly 78% nitrogen, 21% oxygen, and less than 1% CO2 and other gases. By producing a fine spray of bubbles, the surface of each of which is in contact with the surrounding water, the diffuser will increase the amount of all these gases dissolved in your tank.
 
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