HomeFreshwater aquarium fishSouth & Central American cichlidsRed discus Red discus (Symphysodon discus) Scientific name: Symphysodon discus Heckel, 1840 The Red discus (Symphysodon discus) is a freshwater fish of the family Cichlidae that grows to about 18 cm (7.1 in). It is moderate to keep and peaceful and needs a tank of at least 210 L (55 US gal), water at 27–33°C (81–91°F) and a pH of 4.2–6.5. Native range: South America, Brazil, Colombia, Peru, and Venezuela. Red discus care at a glanceCare levelModerateTemperamentPeacefulAdult size18 cm (7.1 in)Minimum tank210 L (55 US gal)Temperature27–33°C (81–91°F)pH4.2–6.5DietCarnivore. Accepts flakes, frozen foods and live foods. BiologyFeeds on worms, crustaceans, insects and plant matter. Maximum length 20 cm TL.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameSymphysodon discusFamilyCichlidae (Cichlids)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length12.3EnvironmentFreshwater;; pH range: 4.2 - 6.2; dH range: 0 - 1 benthopelagicClimateTropicalDistributionSouth America: Amazon River basin in Brazil, near the mouth of the Negro River, in the lower Abacaxis River, and in the lower Trombetas River.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More south & central american cichlidsUaruUaru amphiacanthoidesGoldeneye cichlidNannacara anomalaDemon eartheaterSatanoperca jurupariUmbrella cichlidApistogramma borelliiFlag acaraLaetacara curvicepsRedbreast acaraLaetacara dorsigeraSee all south & central american cichlids Can it live with...?Red discus and Cockatoo cichlidRed discus and Demon eartheaterRed discus and Goldeneye cichlidRed discus and Green terrorRed discus and Ram cichlidRed discus and Redbreast acaraRed discus and Threespot eartheaterRed discus and UaruRed discus and Umbrella cichlid SourcesTaxonomy, distribution and biology data: FishBase (Froese, R. and D. Pauly, eds.), licensed CC BY-NC 4.0. Aquarium care parameters compiled, checked and converted to metric and imperial units by Guppies.za.net.Last updated 28 September 2026