Estone Double Head Bio Sponge Filter Breeding Fry Shrimp Aquarium Fish Tank Large surface area that is essential for benefical bateria to colonize while act as mechanical filter Great for any type of aquarium setting, especially in tanks with small frys, small fishes or shrimps because it does not have a strong intake Made with non-toxic material that will last for a long time. supplied with two very strong suction cups Recommanded to use as secondary or supplementry filtration for larger aquarium (30 Gallon+) although it can be used by smaller aquarium This filter can be easily reassembled or repositioned to fit your needs, it features easily detachable joints, fitting; replaceable sponges