That is what I'm using (including a 5lb tank) on my little 16gal aquarium. It has been working well so far (3 months). The big thing I learned during setup was not to ignore the part about using a little oil to lube the tube you insert. If you don't, there will be a leak and it will refuse to jam all the way in otherwise. With that solved, my co2 rate has been steady and solid.