tarzoo, the , is a species of native to rivers of the western Amazon Basin upriver from the Purus arch, although it occasionally occurs downstream. An introduced population in the River is based on stock from the region. The green is found in habitats with a high temperature of 27–30 °C (81–86 °F) and low pH of 4.8–5.9. This species grows to a length of 13.2 centimetres (5.2 in) SL. S. tarzoo has red spots on the anal fin and body, which separates it from other discus species.
The scientific name was coined by Earl Lyons in 1959, and the species was revalidated by pattern, morphology and mtDNA in 2006. Later studies have confirmed its distinction, although some suggest the correct scientific name for the green discus is S. aequifasciatus (a name typically used for the blue/brown discus). To date there is one known area where green discus naturally hybridise with S. aequifasciatus (blue/brown) discus. Chris. 📸 H. Crizanto.