Spotted Metynnis (Metynnis maculatus)

The Spotted Metynnis is a peaceful, schooling Silver Dollar species recognised by its shimmering body and distinct black spotting across the flanks. Active and hardy, they make an excellent choice for medium to large community tanks. Their energetic schooling behaviour and attractive patterning make them a standout display fish.
 
Care Sheet
Scientific Name: Metynnis maculatus
Common Name: Spotted Metynnis / Spotted Silver Dollar
Origin: South America – Amazon & Paraguay River Basins
Temperament: Peaceful, schooling
Adult Size: 14–16 cm
Life Expectancy: 8–10+ years
Difficulty: Easy
Minimum Tank Size: 300 litres (larger recommended for schools)
 
Water Parameters:
Temperature: 24–28°C
pH: 6.0–7.5
Hardness: Soft to moderate
Water Flow: Moderate
Lighting: Moderate to bright
 
Tank Setup:
Keep in groups of 5 or more
Large open swimming space essential
Use driftwood, rocks, and hardy plants (they may nibble plants)
Strong filtration to handle their high activity and waste
Provide floating plants or dim areas to reduce skittishness
 
Feeding:
Primarily herbivorous:
Veggie-based flakes and pellets
Spirulina wafers
Blanched vegetables (spinach, zucchini, peas)
Occasional treats: bloodworm, brine shrimp, daphnia
Limit excessive protein to prevent digestive issues
 
Behaviour & Compatibility:
Very peaceful schooling fish
Ideal tank mates include:
Severums
Geophagus species
Larger tetras
Peaceful catfish (Corydoras, plecos)
Rainbowfish
Avoid fin nippers or aggressive cichlids
Safe with most community fish but may eat very small tank mates
 
Breeding:
Rare in home aquariums
Requires soft, warm, clean water
Egg scatterers among dense vegetation
Parents do not care for eggs
Fry require infusoria followed by baby brine shrimp