Description : This is a built - in filter , using environmentally friendly senior sponge , air pump or pumps can be connected to achieve the dual effect of aeration and filtration to increase survive rate for fish . This filter produces minimal current and has almost no way to suck the fish through the filter ; especially useful for breeding small fishes , such as dwarf cichlid , guppy , killifish , shrimp and so on . Efficiently remove toxic waste and maintain clean water for your fish ; reduce noise from air pump and consume lowest wattage . Cylinder angle curved shape , space - saving . Easy to maintain . Just take out the sponge and rinse well when it becomes dirty . Specification : Material : Sponge , Plastic , Stone Pipe : Adjsutable : 2 - 10cm / 0 . 79x3 . 94 inch Size : Approx . One Layer : 8x8x8 cm / 3 . 15x3 . 15x3 . 15 inch ; Two Layer : 8x8x16cm / 3 . 15x3 . 15x6 . 30 inch Package Includes : 1x Aquarium Filter Note : Since the size above is measured by hand , the size of the actual item could be slightly different from the the size above . Due to the lighting effects , monitor settings , etc . There could be some slight difference in the color of the pictures and the actual item .