The sera filter and feed pumps FP 100 and FP 150 are among the smallest aquarium pumps and are particularly well suited for nano aquariums. They can be applied in freshwater aquariums between 10 liters (2.6 US gal.) and approx. 50 liters (13 US gal.). Due to their small dimensions of less than 5 cm (2 in.) they fit into almost every internal filter.