I'll have a similar setup like the pictures you posted above. I already ordered the 20" clear filter and ready to place the order for the Mag 5. Btw, smart ideas to have it run separate.
I know that you listed the parts on the previous page but the last two pieces wasn't cleared to me
( 1 x 5/8" T barb with male NPT, for the CO2 injection )
(1 matching female NPT to barb the size of your CO2 hose (3/16" is standard) This one might end up being brass, and that's ok ) - seemed like this is where you connected co2 line. But i thought the co2 connected to the Mag 5 white venturi tubing.
I'll have it hook up to a Mag Drive 5 with the Venturi. Is it possible that you can take a closer picture where the Mag Drive connections and the Co2 injection part?
Also do you think the Mag 5 - 500 flow rate is too much on my 48 gallon tank ? I think too much flow can push the co2 back to the tank.