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Discussion Starter · #1 ·
Hi All,

I've ordered Sumo equipment to upgrade my CO2 system. The cabinet in my Osaka is a little tight compared to more common cabinets. The storage area itself is only 23"H x 14"W x 17"D. The XP3 takes up a good portion of that.

So a 5lb cylinder will be tight. A 2.5lb would be easier to work with for filter maint, etc...

Begs the question of how long does a CO2 tank last? If I'd be refilling a 2.5lb every month, that's a bit of a nuisance, plus added expense. If even a 2.5 would last several months while delivering 2, or 3 bps, then that would be OK and I'll take the space savings.

Thanks
 

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How big (volume wise) is your aquarium?

In general, for CO2, the larger the tank, the more economical it is. Tank prices are not that much different (i.e. $70 for a 5 lb tank, $80 for a 10 lb tank, $120 for a 20 lb tank, etc), and refills are generally the same (I pay the same amount regardless of tank size...).

I would say that a 2.5 lb tank would last perhaps a month, maybe 2 at most at 2-3 bps. Of course, you may require a higher bps depending on your tank size. The best way to check is with a drop checker to ensure you are getting 30 ppm of CO2 into your tank.

I believe Hoppy has said that for larger tanks (say 90 gallons or so), a bubble rate of 10 bps is not unheard of...a 2.5 lb CO2 tank would run out in no time flat.
 

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I would think you might get a month to a month and a half. I use a 5lb tank running around 5bps on a 75 and get about 3 months out of it.
 

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Discussion Starter · #4 ·
Thanks guys. getting a new tank each month will be too ofter for someone like me that travels a lot.

I'l go with the 5 and just leave a coil of tubing so I can move it our of the cabinet on filter maintenance days.

Thanks for the info.
 
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