Its Complete perfect cleaning filter pump for your nao size aquarium. It is easy to clean the filter Suitable for freshwater and marine aquariums. This type of filter is hanged on the edges of your filter. Water from your tank keeps moving through these filters and in-process dirt are sucked up in the filtering media present in the filter. No need to put hands in the aquarium, Its again and again, simply clean filtering media present in the hanging Back Top filter.