Care Level: Moderate

Temperament: Peaceful

Reef Safe: With Caution

General Description: The Argentus Mono, also known as the Silver Moony or Mono Angelfish, has a very large natural distribution throughout coastal and inland waters of Asia, Africa and Australia. The Argentus mono’s preferred habitat depend on their age; juvenile specimens may be found temporarily in freshwater environments but require at least brackish conditions long term. Adults, on the other hand, prefer full marine conditions. Adult and juvenile Argentus monos look similar, having a uniquely-tall diamond shaped silver body and yellow dorsal fin. The exception is that juveniles will also have a pair of vertical brown stripes in the face, which fade with maturity. A social and shoaling species, the Argentus mono should be kept in groups of at least 6 individuals but more are encouraged. All individuals should be introduced at the same time because Argentus monos establish a hierarchical system. An adult Argentus mono can reach a size of approximately 10″. Note: These specimens are already acclimated to full saltwater conditions.

Diet Requirements: Monos are omnivores, however a larger portion of their diet should be plant based. A diet consisting of various frozen foods such as brine shrimp, calanus and other saltwater or freshwater mixes that contain algae, such as spirulina, will maintain optimal health and coloration. We also recommend offering dried seaweed on a rock or clip three times a week minimum. Monos may also accept high quality flake foods and pellet foods.

Care Requirements: An established minimum 90 gallon aquarium is ideal for a group of small Argentus monos. As these grow larger, a 150 gallon aquarium or bigger is more ideal. Argentus monos will appreciate some rock work and crevices to swim through, but prefer a lot more of open and unobstructed swimming space. Frequent, small water changes are encouraged to keep water parameters clean (Nitrates < 20 ppm) as they are intolerable to deteriorating water parameters. Argentus monos require generous water movement and higher oxygen levels due to their activity level. Common tank mates for the Argentus mono are Scats (Scatophagus spp.) and Green Chromis (Chromis viridis), though monos are generally peaceful and can be compatible with a wide variety of fish. As adults, they may be considered more semi-aggressive or pushy. Given their high energy and large adult size potential, we do not think the Argentus mono makes a good reef tank inhabitant which is why they’re listed to be added with caution. Recommended water conditions, 72-78° F, KH 8-12, pH 8.1-8.4, salinity 1.020-1.025.

Purchase Size: Small: 1″ to 1-3/4″; Medium: 2” to 3”; Large: 3-1/4” to 4”

Note: Your item may not look identical to the image provided due to variation within species. Purchase sizes are approximate.