The three spot gourami is a hardy fish.
They can be housed with a variety of tank mates of similar size and temperament.
While males can be territorial with each other, they become timid around other, more aggressive fish.

Male gouramis are known to be very aggressive; they may also be fin nippers and generally may bother other fish in the tank.
They often show aggression toward species with long, flowing fins such as male guppies, goldfish, and bettas, because they display long tails and bright colors, presenting competition for impressing a female gourami.
Female gourami sometimes bother other fish, but usually keep to themselves.

Though aquarists are typically told not to house multiple gouramis together, three spot gouramis that have been brought up together in pairs (usually females, especially if they are siblings) and that have stable personalities, can successfully cohabit with each other, provided there is enough room to swim.
This varies based on individual personalities, but it has been accomplished by aquarists.
In such situations, typically one may assume a more dominant role and grow larger, while occasionally teasing or playfully chasing around the smaller submissive fish, but both will generally be tolerant and cooperative toward each other.
The three spot gourami is a hardy fish. They can be housed with a variety of tank mates of similar size and temperament. While males can be territorial with each other, they become timid around other, more aggressive fish. 
Male gouramis are known to be very aggressive; they may also be fin nippers and generally may bother other fish in the tank. They often show aggression toward species with long, flowing fins such as male guppies, goldfish, and bettas, because they display long tails and bright colors, presenting competition for impressing a female gourami. Female gourami sometimes bother other fish, but usually keep to themselves.
Though aquarists are typically told not to house multiple gouramis together, three spot gouramis that have been brought up together in pairs (usually females, especially if they are siblings) and that have stable personalities, can successfully cohabit with each other, provided there is enough room to swim. This varies based on individual personalities, but it has been accomplished by aquarists. In such situations, typically one may assume a more dominant role and grow larger, while occasionally teasing or playfully chasing around the smaller submissive fish, but both will generally be tolerant and cooperative toward each other.
Three spot gourami