The family of cichlids is also known under Cichlidae. It is part of the order Perciformes and native to Asia, South America, Africa and Europe. The famous 900 cichlid species have a characteristic dorsal fin, consisting of a hard spiny and soft spiny part. Depending on the type cichlids can be long between 3cm and 1m and prefer water temperatures of 22 to 30 ° C. Generally a welfare in a species tank is recommended because the cichlids often behave aggressively towards alien fish. Lake Victoria is considered home to 250 to 350 species of this popular aquarium fish.