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Silver Dollar
Metynnis argenteus
Animalia›Chordata›Actinopterygii›Characidae
📍 Amazon & Orinoco Basins, South America
Large, disc-shaped silver fish that schools impressively in groups. Voracious herbivore — will demolish live plants. Best kept with hardy tankmates in a spacious aquarium.
Care Guide
Diet
Silver Dollars are voracious herbivores that require a plant-based diet supplemented with quality vegetable matter. Feed high-quality vegetable flakes, spirulina pellets, and blanched vegetables like spinach, zucchini, and lettuce once daily. Supplement occasionally with small amounts of live or frozen foods like brine shrimp, but prioritize plant material as their primary nutrition source.
Behavior
Silver Dollars are highly social fish that exhibit impressive schooling behavior and should never be kept alone. They are active mid-water swimmers that spend most of their time in loose groups, displaying natural herding patterns and synchronized movement. These fish are peaceful but will aggressively consume any live aquatic plants, making them unsuitable for planted tanks unless plants are extremely hardy or artificial.
Breeding
Breeding Silver Dollars in captivity is difficult and rarely achieved in home aquariums. They require very large tanks (100+ gallons), specific water conditions, and pairs that have bonded naturally within groups. Successful breeding typically occurs only in specialized breeding facilities with optimal conditions; most hobbyists should not expect to breed them.
Tank Mates
Similar size and peaceful temperament; both tolerate similar water conditions and mid-water zones
Smaller peaceful tetras that occupy similar water zones without aggression toward Silver Dollars
Peaceful schooling fish with similar water requirements and non-aggressive behavior
Small algae-eaters that won't interfere with Silver Dollars and help maintain tank cleanliness
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, rubbing against objects, lethargy
Raise water temperature to 28-30°C, perform daily water changes, use ich medication (malachite green or formalin-based treatments), ensure good filtration and aeration
Fin Rot
Frayed or deteriorating fins, discoloration at fin edges, progressive fin damage
Improve water quality with frequent water changes, reduce stress, use antibacterial medication if severe, ensure adequate tank space and compatible tankmates
Bacterial Infections
Lesions or sores on body, cloudy eyes, loss of appetite, color fading
Perform large water changes, maintain pristine water conditions, use broad-spectrum antibacterial treatments, isolate affected fish if possible
Nutritional Deficiencies
Faded coloration, stunted growth, lethargy, loss of appetite
Provide varied diet with quality vegetable flakes, spirulina, and fresh vegetables; ensure adequate feeding frequency and nutritional balance
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Quick Facts
- pH
- 5.5–7.5
- diet
- herbivore
- maxSize
- 6 inches
- minTankSize
- 75 gallons
- temperature
- 75–82°F (24–28°C)
Temperature
75–82°F
24–28°C