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I am venturing into pressurized CO2. I have purchased a Milwaukee regulator. Now I need a co2 tank. My question is, are the tanks that are
used for beer/soda appropriate for aquarium use? I found a 5 lb. aluminum one on e-bay that is reasonably priced. It is new and never been used. But it is listed for soda/beer. Is this the type to use for an aquarium? Or is there a special one?
 

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has the co2 tank you bought on e-bay been hydrostatically checked? all co2 tanks need to be checked and verified for safe use every 5 years (or 3... not sure).
5, some places will just swap it out, some places will charge you $20. Brand new cylinders should come with a hydro date on them. EDIT: well, actually, all cylinders will have the hydro date, but new ones should have a current hydro date.
 

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Look in your phone book under "Fire Extinguisher", They refill and sell CO2 tanks.

I got a full 15# cylinder with a new test date for $54 out the door, I live in a smaller city also. All the local welding/gas shops wanted $130 for a full 10# cylinder
 
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