VAYINATO BL-8400F Internal Filter For Fish Tank | 25W | 1000L/H | Suits 3.5 Ft Tank Power Aquarium Filter  (Biological Filtration for Salt Water and Fresh Water)

There are four suction cups on the back to hold the filter on the tank wall Made of high quality sturdy ABS housing, stainless steel shaft, durable, fresh water and sea water. Features such as filtration, oxygen absorption, pumping, etc. Removable filter cartridge for better filtration. Small size, easy to hide Duckbill nozzle design, support adjustment of the angle of the water outlet and airflow direction, can be adjusted by 180 Multi-layer biochemical filtration system and large-capacity filtration space for enhanced filtration