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· Premium Member
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I use internal reactors because they dissolve 100% of the CO2 and don’t have to sit in the tank. Just buy one or make one for 20$ or 10$ respectively.

Glass diffusers aren’t that bad, but quite a bit of CO2 does make it to the surface without being completely dissolved.

CO2 reactors are attached to a canister’s filter return pipe (pipe that sends water back to the tank). Just cut the tube into 2 pieces and put the reactor between the two tubes.
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