I can't stand my current set-up. I have a Fluval 404 with a Reactor 1000 plumbed into the return line. The 404 is a pain to maintain and the bottom of the loop for the return line is difficult to clean. I'm wondering if I can run my CO2 into the venturi on a Rena. This way I wouldn't need the 404 or the reactor. I also run a FX5, the Rena would just be for the CO2. I could put bioballs in the Rena to break up the CO2 bubbles.