Silver dollar (Metynnis argenteus) — XXL

Overview of Silver dollar

The silver dollar, scientifically known as Metynnis argenteus, a classic, peaceful schooling fish with a bright silver body and fast, graceful swimming behavior, ideal for large south american community aquariums.. Metynnis argenteus is a species of freshwater ray-finned fishes belonging to the family Serrasalmidae, which includes the pacus, piranhas and related fishes. This fish is endemic to the Tapajós River

Native to Tapajós River Basin, Brazil; Amazon basin, South America, this moderate-care species belongs to the Serrasalmidae family and has earned a loyal following among UK aquarists for its unique characteristics and manageable requirements.

Appearance and Distinguishing Features

True to its name, the silver dollar fish displays a round, disc-shaped body with brilliant silver scales that catch and reflect light. Adults can reach an impressive 20 cm, making them a substantial presence in larger aquariums.

At Tropical Fish Co, we select only the healthiest specimens with vibrant coloration and active behavior, ensuring you receive premium quality fish for your aquarium.

Natural Habitat and Origin

In the wild, Metynnis argenteus inhabits tapajós river basin, brazil; amazon basin, south america. Understanding their natural environment helps us replicate optimal conditions in the home aquarium.

These waters are typically soft, slightly acidic, and rich in tannins from decomposing leaf litter. Dense vegetation provides shelter and feeding opportunities, while seasonal flooding creates dynamic habitat conditions.

Aquarium Setup and Requirements

A minimum tank size of 400 litres is essential for housing Silver dollar. Larger aquariums provide more stable water chemistry and greater swimming space, both critical for long-term health.

Provide appropriate hiding places, suitable substrate, and decorations that match their natural habitat preferences. Good filtration and stable water parameters are essential for all freshwater species.

Invest in quality filtration capable of turning over the tank volume 4-6 times per hour, and perform regular 25-30% water changes weekly to maintain pristine conditions.

Water Parameters and Chemistry

Maintaining correct water parameters is crucial for the health of Silver dollar:

• Temperature: 24-28C
• pH Range: 6.0-7.5
• Hardness: See species-specific requirements
• Ammonia/Nitrite: 0 ppm (zero tolerance)
• Nitrate: Below 20 ppm ideally

This species prefers soft, acidic water. Use RO water remineralized to appropriate GH/KH, add Indian almond leaves or alder cones for tannins, and avoid calcareous decorations that raise pH.

Invest in quality test kits and check parameters weekly. Stability is more important than hitting exact numbers - avoid sudden changes that stress fish.

Feeding and Nutrition

As a omnivore with strong herbivorous tendencies, Silver dollar requires a carefully balanced diet to maintain optimal health and coloration.

Primarily plant-based with some omnivorous tendencies; offer a varied diet of high-quality spirulina-based flakes or pellets, blanched vegetables such as spinach, zucchini, and peas, plus occasional...

Vary the diet between quality flakes/pellets, frozen foods (bloodworms, daphnia, brine shrimp), and occasional fresh vegetables. Nutritional variety promotes vibrant colors, strong immunity, and natural behavior.

Remove uneaten food after 3-5 minutes to prevent water quality degradation. A single weekly fasting day can benefit digestion and overall health.

Behaviour and Temperament

The Silver dollar is classified as peaceful, though individual personality can vary with age, tank size, and stocking density.

This peaceful species thrives in community setups with similarly sized, non-aggressive tankmates. Calm demeanor and gentle nature make it ideal for planted aquariums.

Best kept in a spacious, well-filtered aquarium with open swimming room and secure cover; they are schooling fish that become stressed and skittish when kept singly or in small numbers. Provide...

Compatible Tank Mates

Choose tankmates carefully to ensure a harmonious community aquarium:

Compatible species include:

• Other silver dollars
• Peaceful medium to large South American community fish
• Peaceful plecos
• Geophagus and other peaceful cichlids of similar size

Avoid housing with:

• Small fish that can be swallowed
• Fin-nipping species
• Aggressive cichlids
• Large predatory fish
• Very delicate slow-moving fish

Always research specific compatibility and introduce new fish gradually, monitoring behavior closely during the first few weeks.

Breeding and Reproduction

Breeding is uncommon in home aquariums; pairs or groups may spawn in soft, warm water with dense planting or fine-leaved cover, and adults may eat eggs and fry.

Why Buy Silver dollar from Tropical Fish Co UK

When you choose Tropical Fish Co for your silver dollar purchase, you benefit from:

• Premium Quality: Every fish is quarantined, health-checked, and feeding well before dispatch
• Expert Selection: We hand-pick active, vibrant specimens with excellent coloration
• Safe Delivery: Specialist courier service with heat packs and double-bagged packaging
• Live Arrival Guarantee: We stand behind every shipment with our comprehensive guarantee
• Ongoing Support: Expert care advice available whenever you need it

With decades of combined experience in the UK aquarium trade, we understand what makes healthy, thriving fish. Our Silver dollar specimens are among the finest silver dollar available online today.

Order with confidence knowing you're purchasing from a trusted UK specialist. We're passionate about connecting aquarists with exceptional fish for sale UK wide.