Disk Tetra Care Guide: Round, Shiny and Schooling
This disk tetra care guide highlights a distinctive schooling fish that brings a flash of silver and an unusual body shape to planted aquariums. At Gensou Aquascaping, 5 Everton Park, we recommend the disk tetra to hobbyists in Singapore looking for an eye-catching yet manageable community species.
Species Overview and Origin
The disk tetra (Myleus schomburgkii is sometimes labelled under this name, but the true aquarium disk tetra is more commonly Metynnis hypsauchen or related species) belongs to a group of laterally compressed, round-bodied characins from South America. Found across the Amazon and Orinoco basins, they inhabit slow to moderately flowing rivers with abundant vegetation. Adults grow to approximately 10 to 15 centimetres depending on the species, displaying a tall, disc-shaped profile with a bright silver body that reflects light beautifully. Their shape and sheen make them unmistakable in any aquarium.
Tank Size and Setup
Disk tetras are active swimmers that need space. A minimum tank volume of 300 litres is recommended for a school of five to six individuals, with larger setups preferred. Choose a tank with a wide footprint and plenty of open swimming area in the centre. Because disk tetras are herbivorous and will consume most live plants, consider using artificial plants or restricting live planting to species attached to hardscape, such as Anubias and Java fern, which are less palatable. A sandy or fine gravel substrate works well, and subdued lighting helps display their reflective scales to best effect.
Water Parameters
Disk tetras thrive in a pH of 5.5 to 7.5, a temperature of 24 to 28 degrees Celsius and a hardness of 4 to 18 dGH. Singapore’s tap water typically requires only basic dechlorination to meet these parameters. Ammonia and nitrite must be maintained at zero, and nitrate should remain below 30 parts per million. Robust filtration is essential given the species’ size and appetite. A canister filter with a turnover of four to five times the tank volume per hour provides the mechanical and biological capacity needed. Supplement with an air stone or powerhead if surface agitation is insufficient for gas exchange.
Diet and Feeding
Disk tetras are predominantly herbivorous in the wild, feeding on aquatic plants, fruits, seeds and algae. In the aquarium, provide a staple of spirulina flakes or vegetable-based pellets. Supplement with blanched vegetables such as romaine lettuce, cucumber, zucchini and shelled peas. Occasional offerings of frozen bloodworms or brine shrimp add variety but should constitute no more than 15 to 20 per cent of the diet. Feed twice daily in portions consumed within three minutes. A plant-heavy diet supports digestive health and maintains the bright silver sheen these fish are known for.
Schooling and Behaviour
Disk tetras are peaceful, social fish that must be kept in groups of at least five to feel secure. In smaller numbers, they become skittish and spend excessive time hiding. A proper school moves through the tank in coordinated bursts, creating a mesmerising display of flashing silver. They occupy the middle water column primarily and coexist without significant aggression among themselves. Minor chasing may occur, particularly during feeding, but this is normal and does not typically result in injury.
Compatible Tankmates
Their gentle nature and moderate size make disk tetras compatible with a variety of community fish. Silver dollars, larger tetras, peaceful cichlids such as Geophagus and blue acaras, and robust catfish like bristlenose plecos and Corydoras all make suitable companions. Avoid very small fish that might be outcompeted for food, and steer clear of fin-nipping species that could damage the disk tetra’s delicate finnage. At Gensou Aquascaping, we often see disk tetras featured in South American biotope setups alongside driftwood and tannin-stained water for a natural aesthetic.
Breeding Disk Tetras
Breeding disk tetras in captivity is possible but requires patience and a dedicated setup. They are egg scatterers that release eggs among fine-leaved plants or over a substrate of marbles to prevent predation. Condition pairs with a protein-rich diet and softer, slightly warmer water to trigger spawning. The female may produce several hundred eggs per spawn. Remove adults immediately afterwards. Eggs hatch in approximately three days, and fry should be fed infusoria or liquid fry food before transitioning to baby brine shrimp. A separate grow-out tank helps maximise survival rates.
Health and Long-Term Care
Disk tetras are reasonably hardy when kept in clean, stable water. Common issues include ich during periods of stress or temperature fluctuation, and digestive problems when fed an excessively protein-heavy diet. Maintain a consistent maintenance schedule of weekly 25 to 30 per cent water changes and regular filter servicing. Quarantine new additions for two weeks before adding them to the display. With proper care, disk tetras can live six to ten years, providing years of enjoyment. For sourcing advice and setup consultations, visit Gensou Aquascaping at 5 Everton Park.
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