Anabantoids are considered by some to be the most diverse, and varied of all freshwater fish. In this group there are bubble nesting Bettas (siamese fishting fish), and the Gouramis from S.E Asia. The thing that makes this group unique is that they all posses an auxiliary breathing organ. So in addition to their gills they have what’s called a labyrinth organ, which consists of a series of folded membranes located in the head between the gills. What this allows for Anabantiods to do is breath atmospheric air, which they can take in at the surface of the water. This gives Anabantoids the ability to live in oxygen-poor conditions that would kill other fish that just rely on their gills.
Just make sure that they have access to the surface of the water or they will drown.
The great thing about the Anabantoids group is that most of them can be integrated into many community tanks, where their colors and unique behavior will enhance any aquarium.