[eddiejr]

going to a 55gal tank have a paintball setup now would this work or do,I need a second one:icon_conf

 

[Darkblade48]

A paintball system would work just fine, provided you have a reasonable method of diffusing CO2 into the aquarium.

The "problem" with using a paintball cylinder is that it is rather small, and the CO2 gas will be used up relatively quickly.