ok im kind of new to the whole CO2 injection. i was wondering if i could hook a diy system and run it into the same line with the air pump down to the bubble curtain in my 20g or would the CO2 produce enough to fill out the bubble curtain? or is there a better way to put the CO2 into the tank i have seen something about just putting the tubing into the HOB filter i dont have my bottle set up yet or anything but when i go home i want to set it up if i can i