15D Aquarium Filter Bio Sponge No Glue Foam Biochemical Cotton

15D Aquarium Fish Tank Filter Bio Sponge No Glue Foam Biochemical Cotton Aquarium Filtration Accessories. 15 Layers. The Biochemical Filter decomposes excrement and forage leftovers. Its multi-porous design prevents blockages and provides a large adhesion area for bacteria. The material is thick, durable, and suitable for freshwater and marine water. Size options: 50x11x2.5 cm, 30x40x2.5 cm, 50x40x2.5 cm Color: yellow, blue, white Can be cut to required sizes Lightweight and soft with excellent