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Silver moony

Fish Disease Tips: Only medicate your main tank as a last resort. Use the quarantine tank setup for medicating sick fish and for monitoring new arrivals.
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The Silver moony also known as Mono Argentus, Silver moonfish, Fingerfish or Malayan Angel, is a perciform fish, usually found in the Red Sea and East Africa to Samoa, North to the Yaeyamas, south to New Caledonia and Australia [1]. Silver moony has a silver body in a tringular shape. The big eyes are crossed by a dark ray. Its fins are silver with yellow reflection. Both, yellow and dark colouring, are fading with age [2]. It is also confused, rarely, with Monodactylus Sebae, but easily distinguished by its other black ray that crosses where its tail starts, darker color and less yellow coloration. It’s commonly called fingerfish because its genus Monodactylus means “one finger”.

One of the most commonly kept in brackish water aquaria, it is sad that few hobbyists understand what it really needs and how it live in its natural habitat. It is a shoaling fish that needs to be in groups of three and can grow up to 12 inches, but more commonly 8 inches in aquaria. The biggest requirement for this fish is that as a juvenile it resides in mild brackish water, but travels downstream to ocean, which means as it grows, it needs to be acclimated to increasing specific gravity or salinity. To mimic this in the home aquarium, it should be started at 3-4 tablespoons of marine salt per gallon of water for juveniles. An extra tablespoon would then be added monthly during water changes, the salt should always be dissolved completely in a separate container. It should be continued ’till about a cup of marine salt per gallon is being added, which is the normal marine salinity. To be more accurate, a swing handle or a floating hydrometer should be used to accurately measure the specific gravity, that needs to be raised by 0.002 every month, starting from 1.008 for juveniles to 1.023-1.024 for adults. It may be kept with other marine fish in an FOWLR marine aquarium, provided it is large enough.

Feeding is not much of an issue because they will eat anything once they are acclimated. They will eat flake food, pellet food, bloodworms, tubifex, brine shrimp, spirulina, etc. They also need much vegetable matter, so feed them lettuce, spinach, whatever leafy greens you have on hand.

Tankmates are not much of a worry, as long as they are peaceful such as archerfish, scats, mollies, halfbeaks, etc. They prefer to be in schools and will normally chase each other to establish a pecking order.

There haven’t been any reports about spawning in aquaria, and sexual differences are unknown.

Acanthopodus argenteus
Centrogaster rhombeus
Centropodus rhombeus
Chaetodon argenteus Linnaeus, 1758
Monodactylus rhombeus
Psettus argenteus
Psettus rhombeus
Scomber rhombeus Forsskål, 1775