Black Aquariums Accessories 16mm Biological Bio Balls Aquarium Pond Fish Nano Tank Wet/Dry Canister Filter Media

Features:
Great for fish tanks, to promote gas exchange and increase dissolved oxygen levels.
Great for tropical fish farms, koi ponds, waste water systems, etc.
For use with wet/dry filters (here is not included), to improve biological filtration.
Aiding in the critical gas-exchange process that is needed for successful biological filtration.

Specifications:
Color: Black
Material: Environmental Plastic
Dia: 16mm / 0.7in

Package List:
1 * Bio Balls