Z ZTDM XY-2831 Aquarium Biochemical Sponge Filter Fish Tank Air Pump Sponge filters provide both mechanical and biological filtration Provides the ideal location for bacterial colonization. Does not trap fish fry. Suitable filter when breeding and spawning Discus, Dwarf cichlids, guppies, and killifish. Dimension: 5"L x 1.8"W x 5.5" H Max Tank Size: 10 Gallon