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I am also new to co2 but I'll share with you what I what I found after several days of asking questions and reading stuff online. The DIY method should be sufficient for a smaller tank around 20gal. I used the diy method at first, but later found out I would need 3-5 2 liters going at a time for a 75gal, which would be very messy at best. In a smaller setup where you only need one bottle going at a time that seems like the way to go. A full semi-automatic co2 system ran me around $150-$170, but I already had a co2 tank. The other issue with the diy is there is no shut-off (short of pulling the airline) but since you have a smaller setup I don't think it matters. You may want to get a co2 indicator and see if the diy co2 is working well and save yourself loot. I just went to pressurized because of tank size.
Hope this helps:partyman:
 
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