how fast should a CO2 cylinder last?

i don't know what you're talking about ;)
 
i don't know what you're talking about ;)
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i clean my glass fish regularly with windex...no harm has ever been done
 
the issue with window cleaner is that many of them are ammonia-based. If it got into the tank, it could possibly cause an ammonia spike. That being said, I do clean my tanks with window cleaner. One way to minimize risk is to spray it on to a paper towel away from the tank so you're not spraying near the tank.
 
::senses a derailed thread::

Not Windex, but a very dilute solution of dish soap in water (stirred, not shaken) will foam up nicely wherever there is a CO2 leak anywhere on a CO2 tank or its associated hardware. Feel free to pour as much dilute soap solution on the tank's main valve, each connection (solenoid in/out, bubble counter, needle valve etc.) as you like to check for leaks, but keep it out of the tank.
 
i suggested windex because it is more readily available than soapy water mixture. also from the 4 bars that i have tended bar at, we have always used windex (or equivalent) on tanks to make sure they werent leaking.

i also used windex on my reg when i first set it up for my tank.

the co2 tank, usually being about 3 feet below the (usually closed) tank lid is far enough away (IMHO) to spray windex liberally all over the place.

yes, a minorly derailed thread. i am still a little surprised at how fast you are going through that tank.
 
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