Heckel Discus — Fish Profile
Symphysodon discus
Quick Specs
| Adult Size: | 8.0" |
| Temperament: | peaceful |
| Care Level: | expert |
| Min Tank Size: | 75 gallons |
| Temperature: | 84-88°F |
| pH Range: | 4.0-6.0 |
| Diet: | carnivore |
| Origin: | South America (Rio Negro, Amazon Basin) |
| Lifespan: | 10-15 years |
Overview
The Heckel Discus (Symphysodon discus) is the original wild discus species described by Johann Jakob Heckel in 1840, distinct from the more common Symphysodon aequifasciatus. Identified by the prominent fifth vertical bar — the 'Heckel bar' — which is noticeably darker and thicker than the other four bars. Wild-caught Heckel Discus demand extremely soft, acidic blackwater conditions mimicking the Rio Negro tannin-stained habitat, and are significantly more challenging to keep than tank-bred discus. Best kept in species-only schools of 6+ specimens at temperatures of 84-88°F with pH 4.0-6.0 and near-zero hardness. Not recommended for community tanks — most common aquarium fish cannot tolerate the Heckel's required water parameters.
Care Guide for Heckel Discus
Tank Setup
Heckel Discus requires a minimum tank size of 75 gallons. Maintain water temperature between 84°F and 88°F, with a pH range of 4.0 to 6.0. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Heckel Discus with other species, always choose a tank size that accommodates the most demanding fish in the community.
Feeding
Heckel Discus is a carnivore feeder. Provide a varied diet appropriate for carnivore species to ensure optimal health and coloration. Feed small portions 2–3 times daily, and remove uneaten food after a few minutes to maintain water quality.
Temperament & Compatibility
This species is classified as peaceful. Heckel Discus reaches an adult size of 8.0 inches and has a care level of expert. Always research compatibility before adding new fish to an established aquarium. Individual temperament can vary, so monitor new introductions closely for the first 48 hours.
Origin & Lifespan
Heckel Discus originates from South America (Rio Negro, Amazon Basin) and has an expected lifespan of 10-15 years when kept in proper water conditions with appropriate tank mates and diet.
Compatible Tank Mates
🟢 Good Tank Mates
Compatibility Results for Heckel Discus
All 69 compatibility checks involving Heckel Discus:
Recommended for Heckel Discus
Fluval Plant 3.0 LED — $199.99Dimmable LED for blackwater discus biotope tanks
Expert Care Tips for Heckel Discus
- Large tank required: At 75+ gallons, Heckel Discus needs serious equipment investment. Ensure your filter is rated for at least 1.5× the tank volume.
- Warm-water species: Heckel Discus prefers 84–88°F. Use a reliable submersible heater with a thermostat — avoid temperature swings above 2°F per day.
- Adaptable pH range: Heckel Discus accepts pH 4.0–6.0. Most tap water falls within this range, but always test and acclimate slowly.
- Peaceful community fish: Heckel Discus works well in community tanks. Still, avoid housing with fish large enough to eat them — a 8.0" fish is vulnerable to anything with a mouth bigger than 2×.
- Acclimation: Always drip-acclimate Heckel Discus over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.