If you are looking for a quality internal filter for smaller aquariums then the Eheim Internal Pickup 45 will be a perfect choice. With it\'s simple suction cups means it is easy to attach to your aquarium. In addition the filter canister and cartridge can be removed from above without removing the whole of the filter. This is a brilliant solution which makes filter changes and cleaning a much simpler process and is suitable for aquariums up to 50l. The pump sucks in the water from below and carries it through the filter cartridge to the top. Here the filtered water is directed back into the tank via the rotatable outlet nozzle. Features: Smaller internal filter for aquariums up to 45l. Water inlet at filter bottom. Rotatable outlet nozzle to adjust outflow direction. Filter canister with filter cartridge easy to remove from pump unit from above. Complete with filter cartridge, ready to use. Activated carbon cartridges can also be used (e.g. during aquarium start-ups or after medication treatment).