Has anyone tried Up Aqua Co2 system with the disposable cartridges? I bought one for a VERY good price but I am wondering if there are different qualities of co2. Or Co2 is Co2 is Co2? I also started using a different regiment in my drop checker at the same time. The system gives me a great green color which is just fine. But just to test things out I was trying for yellow(ish) and i haven't yet been able to obtain it? which is why I ask above question. It seems like a great little system so far!? Thank you!