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I had the discussion with Rex about using copper on another forum. It is a good idea if you want to go that route. I didn't want to go that route.

I use the CO2 tubing that bars use to run their draft beer systems. It is extra thick walled and supposed to be resistant to leakage. The 20# tank that has been feeding three 30 gallon aquariums at a rate of 40 bpm, each, for a year now shows minimal (read 'I haven't seen any') loss of pressure in the tank. I think it is working. I bought the tubing from a 'homebrewing' website, along with some fittings and a CO2 regulator. I don't remember the particular site but a search for 'home brew' on Google should find many places if you can't pick a tubing from US Plastics.
 
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