Zerodis 50cmX50cm Cotton Filter Biochemical Sponge Foam Pad Reef Filtration with Different Thickness for Fish Tank Aquarium (50 * 50 2cm)

High Permeability: The sponge with excellent water permeability prevents clogging and provides the largest adhesion area for bacteria, nitrifying bacteria for biological filtration. 【Keep Water Clean】The filter can effectively decompose the excrement and leftover food, allowing the fish to breathe fresh water, keeping the water clean and supporting a good environment for fish. 【: The filter cotton is soft and durable, the dense shape makes it effective to avoid residue, which does not deform for long-term use. 【Lightweight: The light filter with multiple thick holes is very suitable for use in fresh and salt water, which can be cut to any size as you need. 【Sales Service】If for any reason you are not completely satisfied with your purchase, if it breaks, if it is damaged, or even if you change your mind - just let us know and we will make it right quickly.