yes... in at the top, out at the bottom. You are holding it the way it should be installed. This is probably why you are not getting good diffusion, you are pushing the gas right out of the reactor. You need to use gravity to your advantage.
The premise is, the CO2 gas tries to rise, while the inflow (coming from the top) pushes past the gas to go to the outlet at the bottom then back up to the tank. That "contact" time between the inflow and the gas is what causes the diffusion into the water column.
There should never be "clicking" btw. Rex I believe builds those "hollow", ie. nothing is inside of it.
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