Moonlight gourami in the floodplain of the lower Mekong. The moonlight gourami eats insects, crustaceans, and zooplankton. Like all labyrinth fish, the moonlight gourami has a special lung-like organ that allows it to breathe air directly. Because of this labyrinth organ, it is not unusual to see it go to the surface and gulp air. The ability to breathe air allows the moonlight gourami to survive in very low oxygen situations. In fact, if it remains moist it can actually survive out of water for up to several hours. As with other labyrinth fish, these species are oviparous and employ bubble nests
Croaking gourami close to the water surface. At night, they might be found "sleeping" at the bottom, even resting on the substrate (which is not normally a cause for concern), or hovering motionless at the water surface. Like all gouramis, the croaking gourami can breathe atmospheric oxygen from above the water surface using a specialized labyrinth organ (like the Betta) if necessary. It is important, therefore, that the surface of the water be exposed to fresh air, usually accomplished by keeping them in an open-top tank or using a hood that allows air ventilation. If you are using good air pumps, this