If you have the money I would highly recommend investing in a paintball regulator and cylinder. If that's not an option I would highly suggest spending the extra $30 or so for the fluval 88g kit rather than the smaller kit. I have the 88g on my 20g and I works great and I'm actually quite fond of it, but the cylinder only lasts about 3 weeks or so at 1bps and the refills are $18 at my LFS or 3 for $35 on amazon I think, this quickly adds up, believe me. I have the smaller fluval kit that came with the fluval flora 8g and its good, but no pressure gauge and came with a crummy bubble ladder and it will probably only last 3 weeks or so per cylinder again. I tried to get an adapter for the 88g regulator so that it would accept a paintball cylinder, but their gauge has a fail safe that wont allow anything higher than 1000 psi, so using a PB tank didn't help.