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Hi everyone! I am new to the hobby, just starting a 20 gallon planted tank. I just set up my CO2 dosing system, and I noticed the diffuser is outputting bubbles out of a hole at the bottom of the glass coil, rather than it coming out from the top as I'd expect. I have a bubble counter at the regulator already. Does this look correct to you, or do I have a defective unit? Many thanks and forgive my ignorance. :)

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To me, I would have imagined that the CO2 should travel up the coil, and then output from the tip, where a larger pocket of gas would accumulate and then go out of the ceramic disc diffuser.
 
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