Silver Mono

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Monodactylus argenteus - (Linnaeus, 1758)
Silver Mono

Although sold to freshwater hobbyists, this is a brackishwater/marine fish. Aaron Norman


The various species of Mono are flashy and provide constant movement when given space to swim. They are best kept in groups of at least 3–5.

They can tend to be somewhat timid and are brackish to marine fishes that get quite large and are easily frightened.

They can be expected to do poorly in a standard freshwater community tank setting—better in brackish or marine tanks. They are too active for small tanks.

Family: Monodactylidae

Other common name(s):

  • Silver Moony
  • Mono

Native range:

Habitat: Brackishwaters, including streams entering the sea, mangrove swamps, bays. Also near-shore reefs in full-salinity ocean water.

Maximum length: 27 cm (11 in)

Minimum aquarium size: 681 L (180 gal)

Water: Brackish 24 °C (75 °F) - 28 °C (82 °F)

General swimming level: Middle and upper half.


Omnivore. Easily fed zooplankton, dried foods, vegetable matter.

Aquarium Compatibility

Safe with invertebrates and generally uninterested in other fishes. Large specimens may pose a threat to small fishes, however.

Special Care

If bought from a freshwater retail display tank, specimens can be kept in a small quarantine tank that is gradually brought up to full-strength seawater over a period of 3 days.


Pelagic eggs, pelagic larvae.

Reference: 101 Best Tropical Fishes
Image credit: AN
Text credit: KW