UPETTOOLS Fish Tank Nano Air Stone - 2 Inch Aquarium Bubbler, Ultra-High Dissolved Oxygen Diffuser, Aquarium Oxygen Aerator Bubbler Stone for 5 to 30 Gallon Tanks (No Air Pump and Air Tube)Brand: UPETTOOLS Color: White and Brown Features: Package Included for Aquarium Bubbler: Includes a 1. 97 inch nano air disk stone. (Note: 1. 97 inch airstone Not including the airline) It is best to soak air stones in the fish tank for two hours before use Ultra High Dissolved Oxygen Rate: The nano aquarium bubbler can release smaller, denser and more uniform bubbles which makes double oxygen dissolving rate in water. Ideal to increasing oxygen