Symphysodon aequifasciatus, the blue discus or brown discus, is a species of cichlid native to rivers of the eastern and central Amazon Basin downriver from the Purus Arch.

[4] It is largely restricted to water with a high temperature of 25–32 °C (77–90 °F) and a pH of 5.2–7.7.

1; central Amazon from Purus Arch to the Meeting of Waters) and the Xingu group (S. sp.

[4] The Xingu group currently lacks a scientific name, but it is possible that the correct name for the blue is S.

[4] This taxonomy where both S. haraldi and S. aequifasciatus are recognized as described valid species has been adopted by the Catalog of Fishes.