The Green Severum (Heros efasciatus) is a South American cichlid known for its oval, laterally compressed body and olive-green coloration with faint vertical barring. They are generally peaceful for their size, but can become territorial, especially during breeding. They typically reach around 8 inches (20 cm) in length and are often kept in 55-gallon or larger tanks. Green Severums are omnivorous, adaptable to various freshwater environments, and can be a stunning addition to medium to large community tanks, according to aquarium websites.