HomeFreshwater aquarium fishSouth & Central American cichlidsSmooth-cheek eartheater Smooth-cheek eartheater (Gymnogeophagus gymnogenys) Scientific name: Gymnogeophagus gymnogenys Hensel, 1870 The Smooth-cheek eartheater (Gymnogeophagus gymnogenys) is a freshwater fish of the family Cichlidae that grows to about 15 cm (5.9 in). It is moderate to keep and aggressive and needs a tank of at least 150 L (40 US gal), water at 20–25°C (68–77°F) and a pH of 7.0–8.0. Native range: South America, Laguna dos Patos and Lagoa Mirim drainages in Brazil and Uruguay. Smooth-cheek eartheater care at a glanceCare levelModerateTemperamentAggressiveAdult size15 cm (5.9 in)Minimum tank150 L (40 US gal)Temperature20–25°C (68–77°F)pH7.0–8.0Hardness9–20 dGH (161–357 ppm)DietOmnivore. Accepts flakes, frozen foods and live foods. BiologySpawns on the bottom. A male will spawn with more than one female if there is more than one ripe female around. If not, he is satisfied to spawn with one partner and to stay with one female forever. Maximum length 25 cm TL.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameGymnogeophagus gymnogenysFamilyCichlidae (Cichlids)OrderPerciformes (Perch-like fish)ClassActinopterygii (Ray-finned fishes)Maximum length15.0EnvironmentFreshwater; benthopelagicClimateTropicalDistributionSouth America: Laguna dos Patos and Lagoa Mirim drainages in Brazil and Uruguay.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More south & central american cichlidsArgentine humpheadGymnogeophagus balzaniiRedhump eartheaterGeophagus steindachneriEmerald cichlidHypselecara temporalisThreespot eartheaterSatanoperca daemonRam cichlidMikrogeophagus ramireziCockatoo cichlidApistogramma cacatuoidesSee all south & central american cichlids 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