Overview
The Metynnis argenteus, known as the Silver Dollar fish, is a popular freshwater species with a distinctive silver color and disc-shaped body. They require a spacious tank and are best kept in groups to prevent bullying. Their peaceful nature makes them suitable for community tanks, but they are not known to school. They thrive in a well-maintained environment with moderate water movement and plenty of swimming space.
Scientific Classification
| Rank | Classification |
|---|---|
| Family | Characidae |
| Genus | Metynnis |
| Species | Metynnis argenteus |
| Water type | freshwater |
Natural Habitat
Native to the Amazon River basin in South America, the Silver Dollar fish inhabits slow-moving waters with dense vegetation.
Appearance
The fish has a large, round body with a silver sheen and dark blue spots along its sides.
Behavior
The Silver Dollar is generally peaceful but can be aggressive towards other fish if kept in a small space or with fin-nippers. They are not known to school but do enjoy the company of their own kind.
| Trait | Value |
|---|---|
| Temperament | peaceful community fish |
| Schooling | No |
| Activity level | moderate |
Water Requirements
| Parameter | Ideal Range | Notes |
|---|---|---|
| Temperature | 22–26°C (72–79°F) | Use a reliable adjustable heater |
| pH | 6–7 | Avoid sudden swings |
| Hardness (GH) | 5-15 dGH dGH | Soft to moderately hard |
| Ammonia | 0 ppm | Any detectable ammonia signals a problem |
| Nitrite | 0 ppm | Toxic even at low levels |
| Nitrate | <20 ppm | Manage through regular partial water changes |
| Min. tank | 200L (53 gal) | Larger tanks are easier to keep stable |
Interesting Facts
- Can grow up to 25 cm in length
- They have a flattened body that allows them to glide through the water
- They are known to leap out of the water when startled
📋 Full Care Guide
Ready to set up a tank for your Silver Dollar? The complete care guide covers tank setup, feeding schedule, common diseases, tank mates, and breeding.
Read Silver Dollar Care Guide →Related Species
Related Species & Guides
This species profile was reviewed for biological accuracy and practical aquarium care guidance. For suspected illness or disease, test your water parameters first and consult an aquatic veterinarian if symptoms persist.