Nothobranchius or notho killifish is an African freshwater ray-finned fishes genus of the Nothobranchiidae family of Cyprinodontiformes unit. These are the most bright-colored fishes among those that are kept in a tank. Their main distinctive feature is their unusual lifecycle, which is evolutionarily connected with the rain season arrival.
Killifish is not very popular in aquarium husbandry and it is seldom sold in pet shops, though this is the brightest tank fish and a very fascinating one. But it’s not only the rich coloring that makes this fish so attractive. It has rather unusual spawning habit, due to which the fish is called an annotinous one. The fish hatches, reproduces and dies in a period of about a year. In the wild the fish dwells in ephemeral waters, which dry up for a period that lasts about six months.
Badis badis (also known as the blue perch or blue badis) is the most famous Badis genus and Badidae family representative. This is a good-looking dark-blue fish that has been popular among aquarists for several dozens of years already. This calm, not demanding in terms of keeping fish, can be interesting not only for experts but for beginning aquarists as well.
Golden pencilfish (lat. Nannostomus beckfordi, in English it’s Beckford’s pencilfish) is a very small an peaceful tank fish. The article has information on how to keep, feed the fish and what are the best tank mates.