Oscar Care Guide
Astronotus ocellatus · Moderate care · 55 gallon minimum
A big, intelligent 'wet pet' cichlid with serious waste output — needs a 55g+ and strong filtration.
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How big does a oscar get?
A oscar (Astronotus ocellatus) reaches about 12.0 inches as an adult. Plan tank size and tank mates around the adult size, not the small fish you buy at the store.
Tank size & setup
Give a oscar a minimum of 55 gallons, with water at 74–81°F and a pH of 6–8. As a moderate-care, carnivore species, a stable, cycled tank with the right diet keeps them healthiest.
Good tank mates
Pair a oscar with peaceful species that share its temperature and pH range. Compatible options include:
- Choose peaceful fish with overlapping temperature and pH ranges.
About the oscar
The oscar is a species of fish from the cichlid family known under a variety of common names, including Tiger Oscar, Velvet Cichlid, and Marble Cichlid. In tropical South America, where the species naturally resides, A. ocellatus specimens are often found for sale as a food fish in the local markets. The fish has been introduced to other areas, including India, China, Australia, and the United States. It is considered a popular aquarium fish in Europe and the U.S.
Recommended gear for oscars
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