What is the best media for aquarium filter? Filter media for fish tank is a device used to purify water and supplement oxygen in fish farming equipment. Its purpose is to remove feces and other contaminants in the water, keep the water clear, with sufficient oxygen, no harmful substances, and no pollution, which is suitable for the growth of fish. With a good water filter carbon media device in the fish tank, you can keep the fish well and change the water less. There are many types of filters, such as: gas lift biochemical cotton filter, barrel external filter, aquarium top filter, fish tank filter with shape, etc. Non woven fabric is commonly used in fish tank best water filter media. Gas lift biochemical cotton filter: The biochemical cotton is fixed at the inlet of the water pump, and the water flow is forced to circulate in the biochemical cotton by the water pump, and the air is mixed in the water flow to increase…