HomeFreshwater aquarium fishTetras & characinsRedeye tetra Redeye tetra (Moenkhausia sanctaefilomenae) Scientific name: Moenkhausia sanctaefilomenae Steindachner, 1907 The Redeye tetra (Moenkhausia sanctaefilomenae) is a freshwater fish of the family Characidae that grows to about 8 cm (3.1 in). In the aquarium it needs a tank of at least 55 L (15 US gal), water at 22–25°C (72–77°F) and a pH of 6.0–8.0. Native range: South America, Rio Paraguay and Rio Paranaiba. Redeye tetra care at a glanceCommunity tankGoodAdult size8 cm (3.1 in)Minimum tank55 L (15 US gal)Temperature22–25°C (72–77°F)pH6.0–8.0Hardness5–19 dGH (89–339 ppm)DietOmnivore BiologyFeeds on worms, insects, crustaceans and plant matter. Aquarium keeping: in groups of 5 or more individuals; minimum aquarium size 80 cm.Source: FishBase, licensed CC BY-NC 4.0. Species factsScientific nameMoenkhausia sanctaefilomenaeFamilyCharacidae (Characins)OrderCharaciformes (Characins)ClassActinopterygii (Ray-finned fishes)Maximum length7.0EnvironmentFreshwater;; pH range: 6.0 - 8.0; dH range: 5 - 19 benthopelagicClimateTropicalDistributionSouth America: Parana?ba, S?o Francisco, upper Parana, Paraguay amd Uruguay River basins.Conservation status (IUCN)Not EvaluatedThreat to humansHarmlessUsesAquarium: highly commercialResilienceHigh, minimum population doubling time less than 15 months (Preliminary K or Fecundity.) More tetras & characinsEmperor tetraNematobrycon palmeriDiamond tetraMoenkhausia pittieriCongo tetraPhenacogrammus interruptusRed phantom tetraHyphessobrycon sweglesiBlack phantom tetraHyphessobrycon megalopterusNeon tetraParacheirodon innesiSee all tetras & characins 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