Silver Dollar Care Guide
The Silver Dollar (Metynnis species and related genera) is a popular freshwater fish among UK aquarists. Known for its round, disc-shaped body and shimmering silver appearance, it is often described as a peaceful vegetarian cousin of the piranha. Silver Dollars are active schooling fish that make an impressive addition to large community aquariums.
In this guide, you'll learn everything you need to know about Silver Dollar care, including tank size, water conditions, compatibility, feeding, and typical UK prices - plus how to buy or sell them locally.
Quick facts about Silver Dollars
Silver Dollars are native to the rivers and floodplains of South America, particularly within the Amazon Basin. Several species are available in the aquarium trade, including the Common Silver Dollar, Red-Hook Silver Dollar, and Spotted Silver Dollar.
They are fast-swimming, peaceful fish that thrive in groups and require plenty of open water.
Metynnis hypsauchen, Metynnis argenteus, and related species
15-20 cm
South America (Amazon and Orinoco Basins)
300L (80gal)
10-15 years
Peaceful, active, schooling
24-28°C
Primarily herbivorous omnivore
6.0-7.5
£8-£25 per fish
How Many Silver Dollars Should You Keep?
Silver Dollars are schooling fish and should never be kept alone.
- A minimum group of 5-6 is recommended
- Larger groups encourage natural behaviour and reduce stress
- Groups of 8-10 create a particularly impressive display
Keeping too few can lead to:
- Nervous behaviour
- Hiding and stress
- Reduced activity levels
They are most confident when kept in sizeable schools.
Ideal Tank Conditions for Silver Dollars
Providing the right environment helps Silver Dollars remain healthy and display natural behaviour.
- Tank Setup: Large aquarium with extensive open swimming space
- Substrate: Sand or smooth gravel
- Plants & Decor: Driftwood, rocks, and robust decorations
- Water Conditions: Clean, warm freshwater with stable parameters
- Filtration & Flow: Strong filtration with moderate water movement
- Lighting: Moderate lighting
Many Silver Dollars will consume soft-leaved plants, making heavily planted aquariums difficult to maintain.
Compatibility with Other Fish
Silver Dollars are peaceful despite their relation to piranhas.
- Good Tankmates: severums, geophagus cichlids, Congo tetras, bala sharks, rainbowfish, peaceful catfish, and larger gouramis
- Avoid: very small fish, highly aggressive cichlids, and fin-nipping species
Their size and activity level make them best suited to medium and large community fish.
Are Silver Dollars Easy to Care For?
Silver Dollars are moderately easy to care for and suitable for aquarists with larger aquariums.
They require:
- Plenty of swimming space
- Good water quality
- Proper group sizes
- A plant-rich diet
They are generally hardy and adaptable once established.
Silver Dollar Price in the UK
In the UK, Silver Dollars typically cost between £8-£25 per fish.
Prices vary depending on:
- Species and variety
- Size and age
- Availability
- Shop vs hobbyist sellers
Rare varieties such as Red-Hook Silver Dollars often command higher prices.
Where to Buy Silver Dollars in the UK
Silver Dollars are widely available through aquarium shops and specialist tropical fish retailers.
Sourcing fish locally can:
- Reduce transport stress
- Allow you to inspect health and body condition
- Offer better value
TankMate UK helps connect fishkeepers who want to buy, sell, or rehome fish safely - without shipping.
Can You Sell Silver Dollars?
Yes - Silver Dollars are commonly sold and rehomed by hobbyists.
Selling locally is often the best option because it:
- Minimises transport stress
- Avoids the risks of shipping
- Helps connect suitable large-tank keepers
TankMate UK allows you to list fish quickly and find local buyers.
Feeding Silver Dollars
Silver Dollars are primarily herbivorous and require significant plant matter in their diet.
Key Tips
- Feed quality herbivore pellets or wafers
- Offer blanched spinach, lettuce, peas, and courgette
- Supplement with occasional frozen foods
- Feed small portions 1-2 times daily
A varied diet helps maintain health, colouration, and growth.
Common Problems with Silver Dollars
Plant destruction, often caused by:
- Natural grazing behaviour
- Insufficient vegetable matter in the diet
Stress and skittishness, linked to:
- Small group sizes
- Inadequate swimming space
- Sudden movements outside the aquarium
Stunted growth, caused by:
- Small aquariums
- Poor water quality
- Inadequate nutrition
Why Silver Dollars Are So Popular
- Beautiful reflective silver appearance
- Peaceful despite their piranha-like looks
- Excellent schooling behaviour
- Long-lived and hardy
- Ideal for large community aquariums
When kept correctly, Silver Dollars create a stunning display of movement and shimmering reflections that bring life to large freshwater aquariums.
Frequently Asked Questions
Yes, they belong to the same family but are primarily herbivorous and far more peaceful.
Most species grow to between 15-20 cm in captivity.
Yes, they are enthusiastic plant eaters and will quickly consume many soft-leaved species.
At least 300 litres for a proper group, with larger aquariums preferred.
Looking to Buy or Sell Silver Dollars Locally?
TankMate UK connects fishkeepers who want to buy, sell, or rehome fish safely within their local area.
Whether you're building a large South American community aquarium or looking to responsibly rehome fish that have outgrown their setup, you can:
- Browse fish available near you
- List your own fish in minutes
- Avoid the risks of shipping
Explore local listings with TankMate UK and find the right fish for your aquarium.