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Aquarium Sponge Filter 2835 • Keeps your aquarium clean. • Provides mechanical and biological filtration for easy aquarium maintenance. • Suitable for Discus breeding tanks, small tropical fish tanks and fry stock tanks. To use: 1. Before use, soak the bio-foam in aquarium water for 5 minutes. 2. During maintenance, always rinse the bio-foam with drained out aquarium water only. No tap water or hot water should be used at all. 3. When re-using the bio-foam, do squeeze the foam in the water to remove all trapped air bubbles. This will keep the filter stay submerged. 4. Suggest replacing the bio-foam every 6 months, to ensure the filtering effect as well as the growth of the nitrifying bacteria. Dimension (diameter×height): 5.5 × 4.8cm #AquariumSpongeFilter #AyixeFintasticShop