Discus

Also known as: Symphysodon aequifasciatus

Discus are laterally compressed, round-bodied cichlids known for their vibrant coloration and intricate patterns. The Discus originates from Amazon River basin in Brazil, Peru, and Colombia, inhabiting slow-moving, blackwater tributaries with dense vegetation and leaf litter., reaches 15-20 cm in captivity, typically lives 10-15 years, and is kept at 28-30°C (82-86°F). Individual fish vary, so treat this as a general guide rather than a guarantee.

Key facts

Lifespan: 10-15 years.
Adult size: 15-20 cm (6-8 inches).
Temperament: Peaceful but territorial; best kept in groups of 6+; sensitive to stress and water fluctuations.
Minimum tank: Minimum 200 liters (55 gallons) for a group of 6; 300+ liters (80+ gallons) recommended for long-term health and natural behavior.
Water temperature: 28-30°C (82-86°F).
pH range: 5.5-7.0.

Species at a glance

Origin: Amazon River basin in Brazil, Peru, and Colombia, inhabiting slow-moving, blackwater tributaries with dense vegetation and leaf litter.
Adult size: 15-20 cm (6-8 inches)
Life span: 10-15 years
Temperament: Peaceful but territorial; best kept in groups of 6+; sensitive to stress and water fluctuations.
Tank size: Minimum 200 liters (55 gallons) for a group of 6; 300+ liters (80+ gallons) recommended for long-term health and natural behavior.
Water temp: 28-30°C (82-86°F)
pH range: 5.5-7.0
Diet: Omnivorous; requires high-protein diet including live/frozen bloodworms, brine shrimp, and specialized discus pellets; supplement with vegetable matter like blanched spinach.
Other names: Symphysodon aequifasciatus

About the Discus

Discus are laterally compressed, round-bodied cichlids known for their vibrant coloration and intricate patterns. They exhibit strong parental care, with both parents secreting a mucus layer for fry to feed on. In the wild, they form loose shoals in shaded, tannin-rich waters. Captive-bred strains display a wide range of colors including turquoise, red, and pigeon blood variants.

Lifespan and health

With optimal care, discus commonly live 12-15 years, though exceptional specimens may reach 18 years in well-maintained, low-stress environments; longevity is directly tied to consistent water quality and diet. Common health issues include hole-in-the-head disease (linked to poor water quality and vitamin deficiency), internal parasites (especially in wild-caught fish), and bacterial infections from stress or sudden parameter shifts; quarantine new fish for 4-6 weeks and monitor for lethargy, loss of color, or stringy feces.

Overview

Care and tank setup

Tank setup should include a soft, sandy substrate, driftwood, and dense planting with species like Amazon swords and Java fern to mimic natural habitat; use dim lighting and provide hiding spots. Maintain pristine water with weekly 30-50% water changes; use RO water remineralized to 1-3 dGH and peat filtration to lower pH and simulate blackwater conditions. Feed small amounts 2-3 times daily, ensuring all food is consumed within 2-3 minutes to prevent pollution; avoid overfeeding as discus are prone to digestive issues.

Adding a Discus? Research the species’ adult size and temperament carefully, quarantine new fish before introducing them to your tank, and buy from reputable aquarium stores or breeders.

Sources

Breed information on this page is based on the Wikipedia article on the Discus, supplemented with additional research. Reviewed for accuracy.