Red Oscar
Astronotus ocellatus

Care Level




Reef Compatible


Plant Safe


Max Size

12" - 18"

Minimum Tank Size

75 gallon


Red, Black



Water Conditions

Slightly acidic (6.2-7.5 pH), intermediate water hardness (3-12 dGH), 72 to 78 degrees Fahrenheit


General: The Tiger Oscar (Astronotus ocellatus) is a colorful South American Cichlid that naturally occupies slow-moving waterways of the Amazonian Basin. Since becoming introduced to the hobby, there have been many variations of color produced through captive breeding. This species can live past ten years in aquaria and are known to be territorial. An air stone should be implemented in an aquarium with Oscars, as they require an oxygen rich environment but prefer slow current. This species is relatively hardy, but cannot handle many stressors such as pH, temperature, and high levels of NO3 (nitrate) / NO2 (nitrite).

Fecundity (Reproduction): This egg laying species may require an aquarium of 100+ gallons to encourage mating behavior. The female may lay up to 2,000 eggs per clutch.

Aquarium Diet: Carnivorous Cichlid pellet, insects, brine shrimp, blackworms, ghost shrimp, feeder fish

Dimorphism: The only way to determine the gender of an Oscar Cichlid is to wait until they've matured (at an approximate length of 4''), and make observations during displays of breeding behavior. The female Oscar's tube will be longer than the male Oscar's tube.

Compatibility: Other Oscars, Pacu, Arowana, Severum, Jack Dempsey, and larger Synodontis species may be compatible.