Should have CO2 going sometime next week. I have already started my ghetto fertilization with miracle grow indoor plant food spikes. I used them with my heavily planted 20 long with great results. My tank may have good lighting CO2 injection soon and fertilization but I assure you my setup is still pretty ghetto. And since CO2 is cheap like six bucks difference between 2.5lb cylinder and 20lb cylinder. I use a 20lb tank and even the way I use it lasts a really long time. If I had a larger aquarium then I would probably work out a way to make it last longer. But if I stretched out the CO2 in a 20lb tank in a 10g aquarium it may need to be reinspected when I go to refill or exchange.