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Oscar Fish normally reach sizes between 10 and 13 inches in a home aquarium. However, it's possible for an Oscar to exceed this size occasionally, but it is a rare occurrence. If you're in the position where you can have any size tank then obviously you could fill it with as many Oscars as the tank permits. Obviously, most of us can only house small aquariums at home. If your aquarium is no bigger than 75 gallons then that limits you to one adult Oscar. Once you get to 100 gallons + then you can start thinking about having two Oscars. Three or four Oscars would require a sizeable tank well in excess of 200 gallons. A tank of this size would probably need to be custom-made for you.
Agassiz, 1831. Oscar (Astronotus ocellatus) is a species of fish from the cichlid family known under a variety of common names including oscar, tiger oscar, velvet cichlid, or marble cichlid. The scientific name for these species is the A. ocellatus and these grow up to 16 in length (40cm) and weigh over 3 pounds (1.5kg). The Oscar fish is also an intelligent species of fish and is very popular as aquarium fish as well. These are also very aggressive and you need to look after them with great care if you plan to have them in your aquarium.