HomeFreshwater aquarium fishSouth & Central American cichlidsGreen terror Green terror (Aequidens rivulatus) Scientific name: Aequidens rivulatus G?nther, 1860 The Green terror (Aequidens rivulatus) is a freshwater fish of the family Cichlidae that grows to about 23 cm (9.1 in). It is easy to keep and aggressive and needs a tank of at least 210 L (55 US gal), water at 20–24°C (68–75°F) and a pH of 6.5–7.5. Native range: South America, waterways in Ecuador and Peru. Green terror care at a glanceCare levelEasyTemperamentAggressiveAdult size23 cm (9.1 in)Minimum tank210 L (55 US gal)Temperature20–24°C (68–75°F)pH6.5–7.5Hardness4–20 dGH (71–357 ppm)DietOmnivore. Accepts flakes, frozen foods and live foods. BiologyIn small and larger coastal streams. Females care for the eggs and larvae while males defend the territory.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameAequidens rivulatusFamilyCichlidae (Cichlids)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length20.0EnvironmentFreshwater;; pH range: 6.5 - 8.0; dH range: ? - 25 benthopelagicClimateTropicalDistributionSouth America: Pacific slope from the Esmeraldas River in Ecuador to the Tumbes River in Peru.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesFisheries: of no interest; aquaculture: commercial; aquarium: commercialResilienceMedium, minimum population doubling time 1.4 - 4.4 years (Fec=600) More south & central american cichlidsFlag acaraLaetacara curvicepsRedbreast acaraLaetacara dorsigeraCockatoo cichlidApistogramma cacatuoidesRam cichlidMikrogeophagus ramireziThreespot eartheaterSatanoperca daemonEmerald cichlidHypselecara temporalisSee all south & central american cichlids Can it live with...?Green terror and Cockatoo cichlidGreen terror and Demon eartheaterGreen terror and Flag acaraGreen terror and Goldeneye cichlidGreen terror and Red discusGreen terror and Redhump eartheaterGreen terror and Threespot eartheaterGreen terror and UaruGreen terror 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