Emperor Tetra — Fish Profile
Nematobrycon palmeri
Quick Specs
| Adult Size: | 2.0" |
| Temperament: | peaceful |
| Care Level: | beginner |
| Min Tank Size: | 20 gallons |
| Temperature: | 73-82°F |
| pH Range: | 5.5-7.0 |
| Diet: | omnivore |
| Origin: | South America (Colombia) |
| Lifespan: | 3-5 years |
Overview
Emperor Tetras are elegant, regal-looking fish with an iridescent blue-grey body, a long flowing forked tail, and a distinctive black stripe running from eye to tail. Males develop an extended middle ray on the dorsal fin and a trident-shaped tail. They are peaceful and look stunning in dimly lit, planted blackwater tanks. Keep in groups of 6+.
Care Guide for Emperor Tetra
Tank Setup
Emperor Tetra requires a minimum tank size of 20 gallons. Maintain water temperature between 73°F and 82°F, with a pH range of 5.5 to 7.0. A properly sized tank with adequate filtration and regular water changes is essential for long-term health. When housing Emperor Tetra with other species, always choose a tank size that accommodates the most demanding fish in the community.
Feeding
Emperor Tetra is a omnivore feeder. Provide a varied diet appropriate for omnivore 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. Emperor Tetra reaches an adult size of 2.0 inches and has a care level of beginner. 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
Emperor Tetra originates from South America (Colombia) and has an expected lifespan of 3-5 years when kept in proper water conditions with appropriate tank mates and diet.
Compatible Tank Mates
🟢 Good Tank Mates
🔴 Risky Tank Mates
Compatibility Results for Emperor Tetra
All 69 compatibility checks involving Emperor Tetra:
Expert Care Tips for Emperor Tetra
- Mid-size tank: Emperor Tetra needs 20+ gallons. Choose a tank at least 2× as long as the fish's adult size (2.0") for adequate swimming room.
- Warm-water species: Emperor Tetra prefers 73–82°F. Use a reliable submersible heater with a thermostat — avoid temperature swings above 2°F per day.
- Adaptable pH range: Emperor Tetra accepts pH 5.5–7.0. Most tap water falls within this range, but always test and acclimate slowly.
- Peaceful community fish: Emperor Tetra works well in community tanks. Still, avoid housing with fish large enough to eat them — a 2.0" fish is vulnerable to anything with a mouth bigger than 2×.
- Acclimation: Always drip-acclimate Emperor Tetra over 30–45 minutes. Match temperature and pH gradually to prevent osmotic shock.