Co2 diffuser placement

[VanEternal]

Hi Guys,
I am trying to find the best place for my co2 diffuser, the inlet and outlets (will be changing the spray bar to lilys tomorrow) are on the left side and was also considering placing my diffuser on the same side, or will i be better of placing it on the right?

 

[Ria95]

Given the arrangement for the lily pipe I would suggest right (opposite) side for the diffuser so that the filter outflow forces the tiny bubbles down and into the plants. As the plants become denser you will have to make adjustments.
If the diffuser is right below the lily pipe the rising CO2 bubbles are only carried around for a little while.

 

[arcturus]

Check some tips <here>.