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The hydrostatic test stamp is what you're referring to. And the D.O.T. requires it every 5 years for virtually all "industrial" metal cylinders including SCUBA tanks / welding / etc. Last i checked, domestic 20lb propane tanks have an exception and it's 10 years on them. Wound-fiberglass tanks and high pressure paintball tanks have another schedule (I don't know that one off hand)

can someone tell me how long a 20lb bottle of co2 should last?
For just aquarium plant use: 1.25 years for my 72 gallon.
If I'm gassing a lot of vermin I've live trapped: 20lbs lasts 5 months ;)
 
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