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 tone of the pictures and the actual item.