Compatibility Overview
Discus and Ember 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 | Ember Tetra | Verdict |
|---|---|---|---|
| Temperature | 82–88°F | 73–84°F | ⚠️ 82–84°F (narrow) |
| pH Range | 5.0–7.0 | 5.5–7.0 | ✅ 5.5–7.0 |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 8 in | 0.8 in | ❌ 10× difference |
| Min. Group | 5+ | 8+ | 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.
Ember Tetra — Hyphessobrycon amandae
Tiny orange-red schooling tetra that is among the most adaptable nano fish. Peaceful with everything too small to eat them.
Frequently Asked Questions
Can Discus live with Ember Tetra?
Generally not recommended. Discus and Ember 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 Ember Tetra together?
A minimum of 100 gallons is recommended for keeping Discus and Ember Tetra together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Discus and Ember Tetra?
82–84°F (narrow)
Is a Discus aggressive toward a Ember Tetra?
Discus is semi and Ember Tetra is peaceful. Narrow temperature overlap (82–84°F) — keeping the tank at exactly 83–83°F is needed for both species.