These filters allow you to cultivate nitrifying bacteria for superb biological filtration. Great for fry aquariums and brine shrimp hatcheries because they prevent young fry from being trapped in the filter media. Operates silently, creating numerous minute bubbles for increased oxygen flow.

• Provide both mechanical and biological filtration.
• Simply install an airline into the unit and provide both aeration and filtration for your fish. Aerobic bacteria colonize the sponge providing a bacterial substance to facilitate the nitrogen cycle.
• The sponge traps larger waste particles mechanically cleaning the water without trapping baby fish.
• Product dimensions: 2.0"D X 4.75"H. They are useful for as breeding filter or as secondary filter. Or they can be used as pre-filtration unit by fitting to an external or a top filter.

Provide both mechanical and biological filtration.Aquacity