1. Nano filter sponge for fish tank provide both mechanical and biological filtration, trap large bits of waste, and will not get clogged easily. 2.Can be cut to fit your filters. Used for any aquarium or pond filter. 3. Nano filter sponge for fish tank is aquatic pet safe and are made without dyes. Suitable for freshwater or marine aquariums 4.Regular cleaning can be reused after cleaning.it is durable. 5.We are a competitive manufacturer in the aquarium field. We are mainly engaged in the development, production and sales of aquarium filter media and various aquarium accessories. Our main products are: sponge filter, bio sponge, Japan mat, filter brush, bio ball, ceramic rings, active carbon, air stone, etc. We can produce products of various sizes, shapes, and colors according to your needs. Samples or drawings are welcome.