Three Spot Gourami - in The Aquarium

In The Aquarium

The Three spot gourami is a hardy fish. This species can be housed with a variety of tank mates that are of similar size and temperament. While males can be territorial with each other, they become timid around other, more aggressive fish. The ideal tank set-up would be an aquarium of a minimum of 150 litres (33 imp gal; 40 US gal) and have plenty of live plants as well as rocks and driftwood for use as hiding places.

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