BRAND NEW The Ista Disposable Cartridge CO2 Supply Set, 88g, is ideal for nano tanks. These sets can be easily adapted to any kind of tank, even plug and play tanks. Ideal for beginners, and low light tanks, with low demands for CO2. For low light tanks, the rate of 1 bubble every 5 seconds guarantees months of CO2. When you run out, just purchase another ista Disposable CO2 Cartridge (1 unit), 88g. Place the CO2 diffuser at the very bottom of the tank to achieve the best CO2 diffusing effect. Includes: 1 pressurized CO2 liquid cartridge (88g) 1 cartridge supporting rack 1 CO2 regulator 1 (2 in 1) CO2 diffuser bubble counter 1 flexible tube