Compatibility Overview
Discus and Neon Tetra are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Discus | Neon Tetra | Verdict |
|---|---|---|---|
| Temperature | 82–88°F | 72–80°F | ❌ No overlap |
| pH Range | 5.0–7.0 | 6.0–7.5 | ✅ 6.0–7.0 |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 8 in | 1.5 in | ❌ 5× difference |
| Min. Group | 5+ | 6+ | See below |
| Min. Tank Size | 100 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Discus — Symphysodon spp.
The 'king of the aquarium' — beautiful but demanding. Requires very warm, soft, acidic water that excludes most community fish.
Neon Tetra — Paracheirodon innesi
Iconic schooling fish with vivid electric-blue and red stripes. Hardy in captivity; suitable for most peaceful community setups.
Frequently Asked Questions
Can Discus live with Neon Tetra?
Generally not recommended. Discus and Neon Tetra are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Discus and Neon Tetra together?
A minimum of 100 gallons is recommended for keeping Discus and Neon Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Neon Tetra?
No overlap
Is a Discus aggressive toward a Neon Tetra?
Discus is semi and Neon Tetra is peaceful. Temperature ranges do not overlap: Discus needs 82–88°F; Neon Tetra needs 72–80°F.