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Oscar fish (Astronotus ocellatus) are popular freshwater aquarium fish known for their intelligence and bold personalities. While Oscars are often kept alone due to their aggressive and territorial nature, it is possible to keep them with other fish—provided careful planning. Interesting facts about Oscar tank mates include their compatibility with similarly sized, robust fish such as Silver Dollars, Plecostomus, and Severums. These species can coexist because they are large enough not to be seen as prey and resilient enough to handle the Oscars’ dominance. However, small or delicate fish are at risk of being eaten or bullied. The tank must be spacious (ideally over 75 gallons for a pair of Oscars and tank mates) with plenty of hiding spots and strong filtration due to their messy eating habits. Even with suitable tank mates, individual Oscar temperament varies; some may accept company, while others become highly territorial. Always monitor for aggression, and be prepared to separate fish if necessary.