No photo yet
Sign in to submit the first photo
Disk Tetra
Myleus schomburgkii
Animalia›Chordata›Actinopterygii›Characiformes›Serrasalmidae
📍 Amazon & Orinoco Basins, South America
Large, disc-shaped silver fish with a distinctive black vertical band. A peaceful alternative to piranhas for large tanks.
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.
Tank Mates
Similar size and peaceful nature; compatible with soft, acidic water preferences
Peaceful schooling fish with comparable water requirements and non-aggressive behavior
Algae eater that won't compete for herbivorous food sources and tolerates same water conditions
Generally safe but large Disk Tetras may occasionally prey on smaller shrimp; monitor closely
Common Diseases
Ich (Ichthyophthirius multifiliis)
White spots on body and fins, rapid breathing, lethargy, rubbing against objects
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
Frayed or disintegrating fins, white or black edges on fins, lethargy
Improve water quality with frequent partial water changes, reduce stocking density, use antibacterial medication if severe; ensure good filtration
Nutritional Deficiency
Faded coloration, stunted growth, loss of appetite, curved spine
Provide varied diet with quality vegetable-based foods, algae wafers, and occasional live foods; ensure adequate vitamin supplementation
Bacterial Infection
Open sores, cloudy eyes, torn fins, loss of appetite, behavioral changes
Perform 50% water change immediately, maintain pristine water quality, use broad-spectrum antibiotic treatment if condition worsens
Community Photos
0 photosPhotos are added when members log a tank with this species and upload a photo in their tank journal. Add your own tank to contribute.
No photos yet — add a tank with Disk Tetra to be the first!
Sign in to vote.
Tips from the community 💡
0 tipsReal experiences, care advice, and keeper notes. Finn learns from these too.
Sign in to share your experience.
No community tips yet — be the first to share your knowledge!
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