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Juvenile Oscars often play rough with each other by locking jaws and may even attack the sides of a fish, usually inflicting little damage. As these fish mature, even while they are as small as 4 or 5 inches in length, their territorial instincts kick in and these once playful antics can cause real damage. This destructive behavior typically occurs in small aquariums. Oscars will grow to a length of almost 12 inches and require an aquarium of at least 75 gallons for a single fish or 125 gallons for a pair.

When two oscars of the same sex are kept together one will normally become dominant over the other. Sometimes they will enforce their dominance by biting the sides of the less dominant fish; at times they will go to the extreme of knocking off scales which may allow infections to set in. Injured fish should be removed and medicated. To help with territorial aggression, tank decorations can be rearranged on a regular basis.

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