Here's a quick diagram of my tank & circulation system:

Sorry for the crudeness of the model. Also this is only the circulation/filtering, I'm not showing any electronics or heating etc...

As you can see my CO2 is entering from the side of the tank and flows right at my canister filter's return, which send current towards the front of the tank and back towards the inlet of the canister and CO2 pump. Because my tank is long I added a Magnum filter to the right side to give some current flow from that end toward the canister. I only run a mesh filter inside the Magnum and clean it out weekly.

Anyway don't seem to have (that I know of) any issue with the plants in all areas of the tank getting CO2. I was thinking about splitting the return on my reactor into 2 or 3 outlets instead of one, like one on the right, middle, left. But not sure if the effort would make any difference without knowing if there is say less CO2 on the bottom right side of my tank than the left.

Tom/others any comments on my current circulation setup, room for improvements?

Thanks,
Lee