These filters are simply connected via an airline to your air pump. 100% Baby shrimp and fry safe. Small single sponge design for smaller tanks. Air sponge filters are very popular among breeders and multi tank setups.. Features. Simple but very effective biological filter. Useful bacteria attach to the sponges converting harmful ammonia nh3 into nitrate no2 and nitrate no3 . The sponge acts as a grazing meadow for shrimp. Safe for shrimp and newborn fry, as they cannot be sucked into the filter. Easy to connect to an air pump superfish air-flow 1 100l h . Height adjustable through telescopic exhaust pipe, easy installation with a suction cup