Silver dollar
Metynnis argenteus
- Adult size
- 12 cm5 in
- Group
- 5+
- Tank length
- 150 cmabout 5 ft (59 in)
- Lifespan
- 8–10 yrs
- Temperature
- 24–28 °C75–82 °F
- pH
- 5.5–7.8
- Hardness
- 1–15 dGH
- Diet
- herbivore
A skittish shoal of plate-sized fish that will strip most plants; plan for a long tank and only tough or artificial plants.A skittish shoal of plate-sized fish that will strip most plants; plan for a long tank and only tough or artificial plants.
Tank sizes
Good tankmates
Avoid with
- Alligator gar
Alligator gar may eat Silver dollarAlligator gar may eat Silver dollar
- Antenna ray
Antenna ray may eat Silver dollarAntenna ray may eat Silver dollar
- Arapaima
Arapaima may eat Silver dollarArapaima may eat Silver dollar
- Asian arowana
Asian arowana may eat Silver dollarAsian arowana may eat Silver dollar
- Australian pearl arowana
Australian pearl arowana may eat Silver dollarAustralian pearl arowana may eat Silver dollar
- Bullseye snakehead
Bullseye snakehead may eat Silver dollarBullseye snakehead may eat Silver dollar
- Butterfly peacock bass
Butterfly peacock bass may eat Silver dollarButterfly peacock bass may eat Silver dollar
- Channel catfish
No shared temperature rangeNo shared temperature range
- Clown knifefish
Clown knifefish may eat Silver dollarClown knifefish may eat Silver dollar
Common goldfishNo shared temperature rangeNo shared temperature range
- Common river stingray
Common river stingray may eat Silver dollarCommon river stingray may eat Silver dollar
- Congo bichir
Congo bichir may eat Silver dollarCongo bichir may eat Silver dollar
Sources
| temperature | 24–28 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04; agrees with FishBase (fishbase.se), retrieved 2026-10-04 · medium |
|---|---|---|
| ph | 5.5–7.8 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04 · low |
| gh | 1–15 | AqAdvisor (aqadvisor.com), retrieved 2026-10-04 · medium |
| origin | Amazon and Guiana Shield rivers, South America | curated-v0 (needs expert review) · low |
| notes | A skittish shoal of plate-sized fish that will strip most plants; plan for a lon | curated-v0 (needs expert review) · medium |
| beginner friendly | false | curated-v0 (needs expert review) · medium |
| care level | moderate | curated-v0 (needs expert review) · medium |
| color palette | #D0D4D8, #E0A040 | curated-v0 (needs expert review) · low |
| activity | active | curated-v0 (needs expert review) · medium |
| swim zone | middle | curated-v0 (needs expert review) · medium |
| temperament | peaceful | curated-v0 (needs expert review) · medium |
| fin nipper | false | curated-v0 (needs expert review) · medium |
| long finned | false | curated-v0 (needs expert review) · medium |
| territorial | false | curated-v0 (needs expert review) · medium |
| schooling | true | curated-v0 (needs expert review) · medium |
| schooling min | 5 | curated-v0 (needs expert review) · medium |
| diet | herbivore | curated-v0 (needs expert review) · medium |
| lifespan years | 8–10 | curated-v0 (needs expert review) · low |
| growth to adult months | 18 | curated-v0 (needs expert review) · low |
| length weight | {"a":0.04,"b":3} | curated-v0 (needs expert review) · low |
| planted safe | false | curated-v0 (needs expert review) · medium |
| min tank length | 150 | curated-v0 (needs expert review) · medium |
| body shape | cichlid | curated-v0 (needs expert review) · medium |