Myloplus Sp Silver Dollar (5.5-6”)

Scientific Name:

Myloplus spp.

Maximum Size and Lifespan:

• Size: 10–14 inches, depending on the species

• Lifespan: Typically 10–15+ years in captivity with proper care

Recommended Aquarium Size:

• Tank Size: Minimum 120 gallons (680 liters) for adult specimens or groups

• These fish are active, fast-growing, and need a lot of horizontal swimming space.

Water Change and General Care:

• Water Parameters:

  • Temperature: 75–82°F (24–28°C)

  • pH: 6.0–7.5

• Water Changes:

  • Weekly 30–50% water changes recommended due to high bio-load

• Filtration: Strong biological and mechanical filtration is essential

• Décor: Use driftwood, rocks, and open swimming areas. Plants are likely to be eaten.

Tankmates:

• Best kept with:

  • Compatible tankmates include large cichlids (e.g. Severums, Uarus), pacus, arowanas, polypterus, and large barbs like tinfoil.

   

• Avoid:

  • Small fish (likely to be eaten)

  • Aggressive or highly territorial species that may harass them

Diet:

• Omnivorous, with a strong leaning toward vegetation
  

• Vegetation:

  • Blanched spinach, lettuce, cucumber, zucchini, Algae pellets

• Occasional protein:

  • Bloodworms, shrimp, tilapia.

Natural Environment (Overview):

• Native to slow-moving rivers, floodplains, and forest streams in South America, especially in the Amazon and Orinoco basins

• Tend to inhabit heavily vegetated or submerged forest areas where they graze on plant matter, fruits, and seeds

• Often found in shoals, they use numbers for protection from predators

Breeding:

• Rarely bred in home aquaria due to size, aggression, and space requirements

• Breeding behavior:

  • In the wild, likely occurs during the rainy season when rivers flood

  • Pairs spawn in open water or near submerged plants

• In captivity:

  • Some success reported in very large tanks or outdoor ponds

  • Require pristine water and specific environmental triggers (temperature and water level changes)

  • Fry require fine plant matter and infusoria at first, then gradually upgraded to crushed flakes and small live foods

Summary:

Myloplus species are impressive, powerful omnivores that can make great centerpieces in large, well-maintained aquaria. Though they resemble silver dollars, they are generally larger and more robust. Their mixed diet and compatibility with other large species make them a strong choice for experienced aquarists looking for a dynamic, naturalistic South American tank setup.