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Features: The arms holding the sponges are adjustable to position the sponges better away from the tank walls. This filter is perfect for tanks housing baby fry or shrimp as they will not get sucked up and have a food source to eat off the sponge. Efficient product for the price and some fish will enjoy the decreased current in the tank. The nozzle is adjustable which means you can point the flow toward the side of the tank to lessen it if you wish Sponge filters provide both mechanical and biological filtration Aerobic bacteria colonize the sponge providing a bacterial substance to facilitate the nitrogen cycle In addition, the sponge traps larger waste particles mechanically cleaning the water without trapping baby fish 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 Package Includes: 1 x Air Pump Double Sponge Water Filter for Aquarium 1 x 3W aquarium air pump 1 x Airline tubing 1 x Air Valve Kind reminder: To prevent the water backflow and pump damage, the OUT port must connect to the airline tubing.