build looking great so far! what inline diffuser are you going to use? i'm setting up my first planted with rena xp3 and was looking for ways to get co2 injected.
Its a Waterplant Multifunction co2 diffuser. Its a pretty good diffuser, I never see any bubbles and my drop checker is bright green. I have it down line just outside the filter, so I am guessing the co2 is diffusing all the little bubbles on the way out, and little is left in the form of gas by the time it reaches the end.