Red discus, Heckel discus
Symphysodon discus, the red discus or Heckel discus, is a species of cichlid native to the Amazon Basin, where found in the lower Rio Negro, upper Uatumã, Nhamundá, Trombetas and Abacaxis.
This species is essentially restricted to blackwater habitats with a high temperature of 26–32 °C (79–90 °F) and low pH of 4.2–5.2.
This species grows to a length of 20 centimetres (7.9 in) SL.
This species can also be found in the aquarium trade.
Small fry of this fish feed on the mucus secreted by their parents.
