what size co2 cylinder?

[thatguy]

I"m setting up a 120g tank and am going to run an automated co2 system, and was what size cylinder would be the best for it.any help would be great, thanks

[nursie]

I have a 5 lb for my 75. I've had it going a month and haven't used much. Since your tank is larger, you may want to go with a 10 lb.

[loaches r cool]

Around here a 15# bottle was only $10 more than a 5# bottle, so it didnt make much sense to go with anything but the 15# unless you were limited in size. Its lasted me a year so far on my 75g but I dont run it that fast.

[carpguy]

I'd get as big a tank as will fit in your cabinet and as heavy as you can comfortably move yourself.

[Jay]

carpguy has it!!

Schlep factor from point a to b is a real consideration.

Jay