[Darkblade48]

Usually, cylinders larger than 5 pounds have a CGA320 connector, so as long as you have the correct adapter for your Fluval CO2 regulator, you can use it on those cylinders.

 

[japbart]

Usually, cylinders larger than 5 pounds have a CGA320 connector, so as long as you have the correct adapter for your Fluval CO2 regulator, you can use it on those cylinders.

Cause I'm planning to get a cylinder bigger than 5lbs. So if it's bigger than 5 lbs they all have the same size and would need the CGA320 connector?

Don't the sizes vary by the amount of co2 in the cylinder?

Will the CGA320 connector fit in my fluval adapter?

 

[Lukeo85]

With this adaptor you can can upgrade to paintball tank. Not sure if the fluval can be modified to CGA320
Hydra Aquatic CO2 Paintball Adapter:Amazonet Supplies

 

[tipsy mcstager]

heres some reading for you:icon_roll

http://www.aquariumspeed.com/page/a...how-to-adapt-fluval-88-gram-co2-regulator-r68

thinking out loud...........i think all C02 2.5lb tanks and over are standard thread (CGA 320).

unless one like this fits your fluval i think your limted to a paintball tank adapter!
http://www.marineandreef.com/American_Marine_CGA_320_CO2_Tank_Adapter_p/ram00801.htm

i have this tank

http://www.beveragefactory.com/draftbeer/tanks/co2/C5.shtml?bstr=1

and use and adapter if i run out.




how big is the fish tank?
a 22oz paintball tank lasts me about 30 days on a 75 gal

you might think about getting a full size regulator, they can be had under 90$ new
and sell what you've got now?

 

[Darkblade48]

Cause I'm planning to get a cylinder bigger than 5lbs. So if it's bigger than 5 lbs they all have the same size and would need the CGA320 connector?

As mentioned, most likely, if the cylinder is larger than 2.5 pounds, it will have a CGA320 fitting.

To connect your regulator that you have, you will need an adapter.

Don't the sizes vary by the amount of co2 in the cylinder?

I am not sure what you are asking; a 2.5 pound cylinder will be smaller than a 5 pound cylinder. Similarly, a 5 pound cylinder will be smaller than a 10 pound cylinder.

So to answer your question, yes, larger (heavier) CO2 cylinders will have more CO2 in them.