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FishintermediateFreshwater

Disk Tetra

Myleus schomburgkii

AnimaliaChordataActinopterygiiCharaciformesSerrasalmidae

📍 Amazon & Orinoco Basins, South America

Ask Finn

Large, disc-shaped silver fish with a distinctive black vertical band. A peaceful alternative to piranhas for large tanks.

Size12"
Min Tank75g
peaceful
Zonemid

Care Guide

Diet

Disk Tetras are primarily herbivorous and require a diet rich in plant matter. Feed high-quality vegetable-based flakes or pellets as a staple, supplemented with blanched vegetables like spinach, zucchini, and cucumber 2-3 times weekly. Occasional offerings of algae wafers and spirulina-based foods support their natural grazing behavior.

Behavior

Disk Tetras are peaceful, schooling fish that thrive in groups of 6 or more, displaying their distinctive disc shape and vertical black band most prominently in well-established tanks. They are mid-water swimmers with moderate activity levels, spending much of their time grazing on plants and substrate. They are generally non-aggressive toward other species but may nibble soft aquatic plants.

Breeding

Breeding Disk Tetras in captivity is difficult and rarely achieved in home aquariums. They require very specific water conditions, large spawning spaces, and careful conditioning with live foods. Fry are extremely small and require infusoria or specialized fry foods, making successful rearing challenging for most hobbyists.

Common Diseases

Ich (Ichthyophthirius multifiliis)

Symptoms

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

Treatment

Raise temperature gradually to 28-30°C, perform daily 25% water changes, use aquarium salt (1 tsp per 5 gallons) or commercial ich treatment for 7-10 days

Fin Rot

Symptoms

Frayed or disintegrating fins, white or black edges on fins, lethargy

Treatment

Improve water quality with frequent partial water changes, reduce stocking density, use antibacterial medication if severe; ensure good filtration

Nutritional Deficiency

Symptoms

Faded coloration, stunted growth, loss of appetite, curved spine

Treatment

Provide varied diet with quality vegetable-based foods, algae wafers, and occasional live foods; ensure adequate vitamin supplementation

Bacterial Infection

Symptoms

Open sores, cloudy eyes, torn fins, loss of appetite, behavioral changes

Treatment

Perform 50% water change immediately, maintain pristine water quality, use broad-spectrum antibiotic treatment if condition worsens

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Quick Facts

pH
5.5–7.5
diet
herbivore
maxSize
12 inches
minTankSize
75 gallons
temperature
75–82°F (24–28°C)

Temperature

75–82°F

24–28°C

Stats

Community tips0
Kept by0 hobbyists