Help Diy co2 question

[mancas24]

ok so i just hooked up a diy co2 to my 20 gallon. my question is for diffusion do i run the tube leaving the one way valve into the the tank then into the tube which sucks in the water into the filter ( whisper hang on 60 g) . or can i just open the top of the filter and run the tube on the inside of the filter right aginst the impeller.:bowing:

[DAVIDFBT]

I would just put it through the intake, after all, the chopping action of the impeller is what makes the bubbles small and better to diffuse.

[zzyzx85]

^agreed. Directly into the intake so that the CO2 bubble will definitely make contact with the impeller.

[mancas24]

thx guys, thx david

[Riiz]

With HOB filters, its usally best to diffuse into their output, since they outgas CO2 really well.