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Give it purpose - fill it with water filters, air filters, refrigerator filters, and more.
The Fluval A456 fits the following filters:
The Fluval Nano Replacement Aquarium Bio-Foam 2-Pack includes two pieces of Fluval Nano Bio Foam that help trap debris and house beneficial nitrifying bacteria in your aquarium tank. This aquarium Bio-Foam fits the Fluval Nano Filter and provides efficient mechanical filtration. This aquarium foam filter prevents debris bypass and promotes efficient water flow.
Fluval Nano Replacement Aquarium Bio-Foam 2-Pack specifications: