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I have the same system in 2 different aquariums and I run them about 2 bubble per second about 7 hours a day. My 5 pounds cylinders hold about 4 months before empty so far. Even thought, I have received advise that this is still too low and these should hold a year. Now having 4 months is not so bad as I started holding only one month. Your system holding only 2 weeks will defenitively have a leak.
