Biorb Ceramic Media and the hang-on filter does

and the hang-on filter does not take up any space inside the aquarium

Efficient: Large filter surface in the smallest space for effective water filtration

effectively converting it to a hang-on-back filter

Internal diffusing space using water flow to increase CO2 dissolving rate

Biorb Ceramic Media and the hang-on filter doesProduct Description Details 450g Ceramic Media The ceramic media in your biOrb forms the main part of filtration and is important in keeping the water clear and healthy. Beneficial bacteria colonise the ceramic media and remove toxic fish waste from the water as the water flows through it. biOrb ceramic media is full of pores for bacteria to live on, just 900g of ceramic media has the surface area equivalent to a football pitch. You can add more media