I got the idea from after seeing some of cal teks in line diffusors. I was going to just buy one of those cause I liked the look.... until I saw the cost. .. AND there wasnt one big enough for my tank. At any rate what I am going to do, I have already picked up a 55mm atomic diffusor and the nesscary PVC pieces. I settled on using a 2 inch Y assembly. Unless I can find a 1/8 two way barb, the CO2 hose will be poked through a screw on cap and sealed (this way it allows me to clean/open if nessecary) the diffuser will mount inside most likely free hanging / suction cupped to the interior wall. The straight portion will be capped off with barb attachements sealed in place to attach the hose pieces to. I went this route in order to keep the overall flow of the water and I wont have to worry about "crud" collecting on media stuffed in there to break apart the CO2, after the diffuser housing it will pass into the aquarium as normal through the return. I figure with the size of the new tank (125 gallons) this would be the best way to saturate the water with the needed CO2. Below is a little diagram Overall around 40-50 bucks invested.
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