How many oscar fish can stay together?

Two to five oscar fish can stay together. Oscar fish are social creatures, so they enjoy being in pairs or small groups.

However, oscar fish require a lot of space to thrive. A full-grown oscar typically needs a 55-gallon tank or larger. For every additional oscar fish, you need to add at least 20 gallons to the tank. If you have limited space, just stick to keeping a pair of oscar fish.

Additionally, you shouldn’t attempt to keep three oscar fish together, as two of them may bond together and dismiss the third one.