The Scalare, also called Segelflosser or Pterophyllum, are a genus of cichlid family, and thus belong to the order Perciformes. They are originally establish in the Amazon region and prefer water temperatures ranging between 24 to 28 ° C. As juveniles they live in flocks, but later form an area and form a family, which is characterized by pronounced partner loyalty. A characteristic common to the Scalar is its triangular, flat shape, which distinguishes them from other groupers. The size of the scalar species depends and varies in nature between 15 and 16cm. They are among the most popular freshwater fish of the aquarium.