I am confused with my 20 gallon Co2 cylinder size?

[Daimond]

I am confused with my 20 gallon Co2 cylinder size?
I am going to buy a Co2 cylinder for my 20 gallon aquarium i have 2 options
5 litter cylinder or 8 litter cylinder
which one is suitable for my aquarium size ? and how long the cylinder will last (i will go for 2 babble per second )

Thanx

 

[Bert2oo1]

The I'd say the 5 would be big enough but if u can afford the 8 go the 8. The more the better. I'd say it would last u 6-8 months? Maybe more

 

[auen1]

How does a 20 pound bottle compare to a 5 liter?
My gas supplier sells gas by the pound.
Thanks!

 

[Bert2oo1]

How does a 20 pound bottle compare to a 5 liter?
My gas supplier sells gas by the pound.
Thanks!

20lb holds 18litres so it's 3x larger

 

[Daimond]

The I'd say the 5 would be big enough but if u can afford the 8 go the 8. The more the better. I'd say it would last u 6-8 months? Maybe more

Thanks but 6-8 months for the 5 liters or 8 liters? and i going to use a solenoid valve with the system that will double the period or ur saying 6-8 months with
the solenoid valve
and thanks again

 

[Bert2oo1]

Thanks but 6-8 months for the 5 liters or 8 liters? and i going to use a solenoid valve with the system that will double the period or ur saying 6-8 months with

the solenoid valve

and thanks again

8 litre should last 6-8 with a solenoid.

 

[Daimond]

8 litre should last 6-8 with a solenoid.

Thanx i will go for ur advice