Gymnocorymbus ternetzi Fish Profile: Genus Gymnocorymbus Species ternetzi Common name black Tetra Origin South/Middle America Tank Size min. 40 - 80 cm Temperature 22 - 25 °C pH Value 5.0 - 6.0 Fish Size 5-5,5 cm Food Omnivore Care Sociable, Schooling fish, Diurnal