Astatotilapia nubila

The Hap Nubilus cichlid has a widespread area of natural distribution throughout the satellite lakes and rivers of the Victorian basin. Here, it is most commonly found in shallow, heavily-vegetated areas close to shore. The aquarium should be at least 4ft long and aquascaped with rocky outcrops, some open expanses of sand, and thickets of dense planting. Décor such as ocean rock can be used to build sturdy structures which stretch from the base of the tank to near the surface of the water. These structures should be built with the purpose of creating many crevices for the fish to explore but constructed in such a way so as to keep the rocks stable if the fish start to dig around and underneath them. A substrate of coral sand or Aragonite will assist in keeping the water hard and alkaline. Hardy plants such as Anubias sp. and Vallisneria sp. should do well under such conditions. Filtration should be efficient, with moderate water flow and a good level of oxygenation. Regular partial water changes will help keep nitrate to a minimum. The Hap Nubilus is an aggressive species, and it is best to keep one male in a harem situation with a large number of females (keeping just one female with a male will result in continual harassment and death). If more than one male is to be kept, the tank must be much more voluminous with a plethora of visual barriers, and again, they must be vastly outnumbered by females. These fish tend to hybridise freely with many other closely related Victorian cichlids, so are best maintained in a species tank environment or alongside robust Lake Malawi mbuna, which have very similar requirements - however, do research individual species thoroughly to ensure compatibility. This species is listed as Viulnerable on the IUCN redlist for threatened species, due to the introduction of invasive predatory species, pollution, and hybridisation due to decreased water transparency (eutrophication and erosion leading to increased sedimentation and runoff ) which interferes with mate recognition cues. Hap Nubilus are bred on a commercial basis for the aquarium trade, and are thought to be widely distributed amongst hobbyists. May also be seen on sale as the Blue Victoria Mouthbrooder.