sentences:  The rainbow cichlid prefers a pH range of 7.0–8.0, water hardness of 9-20 dGH and a temperature range of 21–36 °C.The rainbow cichlid was first described in 1867 by Albert Günther and was then placed in the genus "Heros", a synonym of "Cichlasoma".In 1903, it was removed from the "Cichlasoma" and placed in its own new genus "Herotilapia", solely on the basis of its unique tricuspid teeth, an adaptation to eat filamentous algae.