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Hey guys, I've been doing some research on adding Co2 to my aquarium set-up and came across a few paintball tank set-up's. eBay has a regulator system that screws on to the Paintball tank for $32.00, Amazon has a Inline diffuser kit with the inline filter and line for $25.00, and the 20oz Co2 tanks usually run $20.00 at Academy. The few set-up's I've seen the people say they get 2-3 months out of a tank but I know that depending on what size aquarium you have will depend on how long the Co2 will last. On a good note the tanks are super cheap to be refilled, last time I had one filled was less then $5.00! How many of you guys use this set-up or have any input on what route I should take?