Modular internal aquarium filter with filter media. The sera fil internal aquarium filters 60 and 120 are low mainenance internal filters for smaller aquariums up to 60 or 120 liters respectively. They can easily be attached to the aquarium glass by means of suction cups. The filters are ready for use and include filter material (sera fil 60: active carbon and sponge and sera fil 120 additionally sera siporax mini Professional). They ensure crystal clear water in the aquarium. The filters can be installed both vertically and horizontally and they are also suitable as filters for aquaterrariums. They include spray bar tube angle and Venturi nozzle. The filters can be extended modularly with separately available filter chambers.