Protect shrimp and fishThe filter cotton is filtered in multiple layers, which completely prevents shrimp and fish from being sucked in. Prevents cloggingIt can prevent the large foreign bodies from being sucked into the filter system and blocked. UsedSuitable for aquariums, to protect shrimp and small fish, and to clean water quality. High qualityOur aquarium filter cotton is made of high quality sponge with good filter effect Increase the oxygen content of the aquariumThe principle of biological filtration using multi-layer filtration to cultivate high-density nitrifying bacteria to achieve the effect of increasing the oxygen content of clean water Product Description Description Description: Filters are ideal for aquariums to promote gas exchange and increase oxygen dissipation. ous. Filters are an effective way to ensure the safety of shrimp and fish Product specifications: Material: ABS + cotton Size: see size chart Weight: 177 g Scope of delivery: 2 * aquarium filter (black ) Note: 1. Please allow 0-1cm error due to manual measurement. Thank you very much for your understanding. 2. The monitor is not calibrated immediately. The color of the object shown in the photo may differ slightly from the real object. Please take the real standard.