Aerobic bacteria colonise the sponge providing a bacterial surface to facilitate the nitrogen cycle. In addition, the sponge traps larger waste particles and mechanically cleans the water without trapping baby fish.
They are useful as a breeding filter or as a secondary filter in the aquarium.
These filters are ideal for breeding / fry tanks, and are very popular among cichlid / discus keepers.
Please use the dropdown menu to select the correct filter
