Product Details

Blue Discus – Symphysodon discus

The Blue Discus is a premium freshwater cichlid valued for its rounded body shape, calm movement and rich blue colouration. Listed here as Symphysodon discus, this fish should be treated as a specialist warm-water discus requiring mature filtration, stable soft-water conditions and peaceful tank mates. Discus are gentle compared with many cichlids, but they are not low-maintenance community fish and are best suited to aquarists prepared for consistent water care

Key Identification:

Common Name: Blue Discus
Other Names: Blue Discus Fish, Blue Heckel Discus, Domestic Blue Discus, Blue Strain Discus, Discus Cichlid
Scientific Name: Symphysodon discus
Fish Type: Cichlid / Discus
Water Type: Freshwater

Natural Range & Habitat:

True Symphysodon discus is native to the Amazon basin in Brazil, including areas near the mouth of the Rio Negro and parts of the lower Abacaxis and Trombetas river systems. Wild fish are associated with very warm, soft, acidic waters, often around submerged roots, branches, shaded margins and slow-moving blackwater habitats.

Most Blue Discus in the aquarium trade are captive-bred ornamental strains rather than wild locality fish. Captive-bred discus are usually more adaptable than wild specimens, but they still require warm, clean, stable water and should not be added to immature aquariums.

Appearance & Adult Size:

Blue Discus have the classic tall, rounded discus shape with long dorsal and anal fins forming a near-circular outline. Colour varies by strain and individual fish, but Blue Discus may show powder blue, cobalt, turquoise, royal blue or blue-green tones, sometimes with faint vertical bars, fine patterning, red eyes or darker stress bars.

Adults usually reach around 15–20 cm, with a deep body that needs both tank length and height. True S. discus is recorded at up to around 20 cm total length, while blue domestic discus strains are usually sold and grown on as large, showy aquarium cichlids.

Aquarium Suitability:

This fish is best suited to a specialist discus aquarium, peaceful warm-water South American display or carefully planned soft-water community. The aquarium should be mature, quiet and stable, with excellent filtration, gentle flow, open swimming room and shaded cover. Smooth wood, roots and warm-tolerant plants can be used, although many keepers raise young discus in simpler, easy-to-clean setups.

Blue Discus are not suitable for brand-new aquariums, hard-water livebearer tanks, aggressive cichlid communities, cool-water aquariums or busy community tanks with fast, pushy feeders.

Recommended Aquarium Size:

A practical minimum is 250–300 litres for a group of young discus, with a tank length of at least 120 cm recommended. Larger aquariums of 350 litres or more are strongly preferred for adult groups and community setups. Discus are social fish and are usually best kept in a group of 5–6 or more, unless maintaining a confirmed breeding pair in a dedicated setup.

Water Conditions:

Temperature: 28–30°C
pH: 5.5–7.0
Hardness: Soft preferred
Additional Notes: Warmth and stability are essential. Keep ammonia and nitrite at zero, nitrate low, and avoid sudden changes in temperature, pH or hardness. Captive-bred Blue Discus can often adapt to slightly different pH values, but they still need very clean water and regular maintenance. Wild or true S. discus types should be treated more strictly as soft, acidic blackwater fish.

Temperament & Tank Mates:

Aquarium Category: Community Fish

Blue Discus are peaceful cichlids, but they are slow, deliberate feeders and easily stressed by boisterous fish. Suitable tank mates include warm-water Cardinal Tetras, Rummy Nose Tetras, peaceful pencilfish, Sterbai Corydoras, small plecs, calm dwarf cichlids and other gentle species that tolerate discus temperatures.

Avoid fin-nipping barbs, aggressive cichlids, large predators, cool-water fish, hard-water livebearers, very fast feeders and any species that cannot tolerate 28–30°C long term. Discus should normally be kept in groups, as small numbers can lead to bullying and poor confidence.

Feeding:

Blue Discus are carnivorous-leaning omnivores that need a varied, high-quality diet. Offer specialist discus granules, soft sinking pellets and quality frozen foods such as bloodworm, brineshrimp, mysis, white mosquito larvae, chopped mussel and prepared discus mixes. Some vegetable or spirulina-based foods can be included for balance.

Young discus benefit from smaller, more frequent feeds, while adults can be fed more moderately. Remove uneaten food promptly to protect water quality.

Behaviour in the Aquarium:

Discus are calm, social midwater cichlids that glide through the aquarium rather than constantly darting around. In groups, they form a social hierarchy, which is normal, but bullying can become a problem if too few are kept or the aquarium is too small. Pairs may become territorial when breeding and choose a vertical surface, wood or broad leaf as a spawning site.

Discus are famous for parental care, with fry feeding from mucus produced on the parents’ flanks during early development.

Care Notes:

Add Blue Discus only to a mature, stable aquarium. Maintain high temperature, soft clean water, regular water changes and peaceful tank mates. Quarantine new discus where possible, especially before mixing with established fish. Avoid sudden chills, rough handling, poor diet and high nitrate. Do not mix wild or newly imported discus casually with domestic strains without careful health management. This is a specialist fish best sold to customers prepared for disciplined maintenance.

Recommended For:

Experienced

Availability:

Common to occasional / Usually captive-bred colour strain

Image Disclaimer:

All images are a visual representation of the fish you will receive, made to be as accurate as possible. Natural variation in size, blue shade, pattern, body shape, bar intensity and markings can occur between individual fish.