Not log.
It really depends on how many bubble per second you had your setup
running. It is MUCH cheaper in the long run to get the largest tank
that will fit in your space.
A 5 lb tank refill may cost 22 while a 2.5 lb may cost 20 for a
refill.

Marc
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On 3 Nov 2004 09:12:29 -0800, (lawrence zarb)
wrote:

Can someone tell me how long a disposible 500g CO2 cannister should
last in a 55g tank setup?