2 Layer Aquarium Black Sponge XY-1813

2 Layer Aquarium Filter Fish-Purifying and Filtering 100% brand new and high quality. Safe and durable product for your pet. Can be used in marine, fresh water and planted tanks. Can improve the quality of watr and then will reduce the mortality rate of fish in the tank. Filters can be reused continuously. 1. This product is suitable for seawater tanks, fresh water tanks, aquatic plant cylinders, the size of the pieces is free. 2. Secret holes and softness that are most suitable for growing nests of fine nitrifying bacteria through expert analysis. 3. Biochemical cotton decomposes impurities and feed residues, improves water quality and keeps filters clean. The best result is reduced fish mortality. 4. Routine cleaning! (About 10-20 days for washing) can be reused after cleaning. Perfect filter accessory for your aquarium and tank.