I have an update on the co2 system! About 5 minutes ago Mark from AquariumPlants.com called me to inform me they were out of 10lb cylinders but would get more in Friday. He also said he would upgrade my cylinder from a 10lb to a 15lb for no extra charge. I asked him if he meant to say 20lb because the website has no mention of any 15lb tank. He told me they JUST started carrying 15lb tanks and I was going to be the first person to get one!!!! I told him that was great and asked him if it had a black handle because the website states some regulators will not fit on tanks with the handle. He told me yes, the 15lb does have a handle, but the handle is removeable. If you remove it, the regulator will fit fine. So now my 15lb cylinder plus others will ship either late today or early tomorrow and he said he expects my shipment to arrive on Friday or Monday. I will be on vacation next Monday so thank god I had this thing sent to work! And hopefully it will end up arriving Friday too! Although regardless I probably won't leave it up and running for 8 days without any supervision. Success! They had me worried their for a moment.