Cichlids are attributed to the order of the Perciformes and live in South America, Africa, Asia and Europe. One common feature of all known 900 species is the characteristic dorsal fin, which is divided into a hard spiny and soft spiky area. The cichlids are of different lengths depending on the type and can also be 1m or 3cm tall. Temperature between 22 and 30°C. The behavior of many cichlid against alien fish is marked by aggressiveness, thus keeping them in a species tank is recommended.