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FishbeginnerFreshwater

Silver Dollar

Metynnis argenteus

AnimaliaChordataActinopterygiiCharacidae

📍 Amazon & Orinoco Basins, South America

Ask Finn

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.

Size6"
Min Tank55g
School5+
peaceful
Zonemid

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.

Common Diseases

Ich (Ichthyophthirius multifiliis)

Symptoms

White spots on body and fins, rapid breathing, rubbing against objects, lethargy

Treatment

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

Symptoms

Frayed or deteriorating fins, discoloration at fin edges, progressive fin damage

Treatment

Improve water quality with frequent water changes, reduce stress, use antibacterial medication if severe, ensure adequate tank space and compatible tankmates

Bacterial Infections

Symptoms

Lesions or sores on body, cloudy eyes, loss of appetite, color fading

Treatment

Perform large water changes, maintain pristine water conditions, use broad-spectrum antibacterial treatments, isolate affected fish if possible

Nutritional Deficiencies

Symptoms

Faded coloration, stunted growth, lethargy, loss of appetite

Treatment

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

Stats

Community tips0
Kept by0 hobbyists