This filter is ideal for small tropical and coldwater aquariums. Depending which fish are kept in the aquarium, large messy fish like goldfish and cichlids will need a filter with a higher filtering capacity. The filter is designed to be completely submerged with the return water spray bar out of the water. Three suction cups fitted to the back of the filter allow for positioning in the aquarium. The dual action filter cartridge consists of a filter foam for mechanical filtration and activated carbon inside the foam for chemical filtration. The easy click system makes cleaning easy, the filter foam can be quickly cleaned or replaced with little fuss. Cleaning of the pump is by removal of the protective cover allowing access to the impeller.