Mono (Monodactylus argenteus)

A popular brackish water aquarium fish, the Mono argenteus or Moony is an extremely widespread fish found throughout the Indo-Pacific region and Africa. This species is amphidromous, which means they regularly move between freshwater in marine habitats. Although they are sometimes marketed as a freshwater fish (and can be kept as such as juveniles), Monos will do best in brackish or marine aquariums. Although juvenile Monos can tolerate pure freshwater for a while, they will need to be transferred to a brackish or full marine aquarium later in life. A social fish often found in large aggregations, they do well in groups of 5 or more.