Ideal for Nano Tanks, these sets can be easily adapted to any tank type, including plug-and-play tanks. They are perfect for beginners and low-light tanks that have minimal CO2 requirements. When set up correctly, the CO2 supply could last for months. In low-light tanks, a rate of one bubble every five seconds can ensure months of usage. For optimal CO2 diffusion, place the diffuser at the very bottom of the tank.