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co2 tank duration and filling.

Am currently looking at buying a co2 injection system for my tanks.  I
have 2 tanks a 55 gallon and a 20 gallon.  My concern is 1) if I
purchased a 5lbs co2 tank for the 20 gallon how long would it last? 2)
where would I get it refilled at? weilding supply companys and the like?