Aquarium Filter Media Ball Aquarium Bio Ball for Aquarium Filter 20PCS

Suitable for fresh water and sea water tank.
Encourages growth of biological colonies and holds large amounts of good bacteria. Great help to restore the natural water quality, and provide the most suitable living environment for your fishes.
Full of rich variety of natural elements and essential minerals and trace elements.
The bio balls are fired by high temperature.
Reduces ammonia and nitrate levels.