Fishing Tank Filter Cotton Aquarium Biochemical Cotton Cultivation Filter Material, 50x12x2cm Medium Hole, 50x50x2cm Small Hole, 50x50x2cm Medium Hole, 50x50x4cm Small Hole, 50x50x4cm Medium Hole, 50x50x2cm Large Hole, 50x50x4cm Large Hole

1. Suitable for seawater, freshwater, aquascape, size can be freely cut
2. Dense pore gap and softness is suitable for cultivating good nitrifying bacteria
3. Decompose excrement and feed residue, improve water quality, good filtration and cleaning effect, reduce fish mortality
4. Wash once a month with water, no blockage, no deformation, can be washed again and again after cleaning
5. Thickened material, strong water permeability, more thorough and detailed filtration
6. Material: cotton