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CO2 cylinders/tanks you can get either from a local welding shop, local gas/air supplier, or even online (shipped empty). If you buy it online, you'll just want to get it refilled locally. You may want to call around before you buy one to make sure they can fill your own tank. That's a dilemma I'm facing right now with mine. The place I was going to changed ownership and now don't do same day fillings. Welding places here won't fill it because they exchange tanks instead of filling them onsite. So, just do some research before buying.
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Is there a difference between the CO2 that goes into fire extinguishers and beer...do I need to shop for the "right" kind of CO2 for my aquarium?