Symphysodon tarzoo is a species of cichlid native to rivers of the western Amazon Basin where it prefers deep waters, hiding between roots and in crevices in rocks. This species grows to a length of 13.24 centimetres (5.21 in) SL. Symphysodon tarzoo differs in colouration from other discus species from the red spots on the anal fin and the body. The species was first discovered by Earl Lyons in 1959, and was named in 2006.