Symphysodon discus
The Heckel discus (Symphysodon discus) is named for the bold horizontal “Heckel bars” or stress pattern on the body, especially prominent in wild fish from Rio Negro–type habitats. It is often considered more specialised than typical farmed aequifasciatus strains: very soft, acidic blackwater, very warm water, and excellent water quality. Wild imports are seasonal and sensitive; tank-raised Heckels are less common but follow similar care. Keep in groups in a tall, spacious aquarium with soft filtration flow and minimal stress.
High-quality frozen foods; discus pellets; beefheart mixes; live or frozen blackworm; varied diet.
Frequency: 2–3× daily
Wild fish may need live foods initially; transition slowly to prepared foods.
Native Region: Brazil (Rio Negro and related blackwater basins)
Deep blackwater with leaf litter, roots, and minimal light.
Blackwater tannin, RO blending, peat or alder cones optional; dim lighting; tall tank.
Activity Level: Moderate
Bar pattern visible when stressed; group behaviour like other discus; shy if water is wrong.
Difficulty: Difficult
Type: Egg layer
Sexual Dimorphism: Subtle; body shape and venting when mature; wild males may grow larger.
Spawning on vertical wood or cone; parents feed fry mucus; extremely soft warm water.
Substrate: Sand
Plant Safe: Yes
Driftwood, leaf litter, floating plants; avoid bright bare tanks.
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