Origin

Colombia (San Juan and Atrato River basins)

Adult Size

4–5 cm (1.5–2 in)

Recommended Tank Size

60 L (15 gal) or larger

Temperature

23–28°C (73–82°F)

pH

5.5–7.5

Behavior

Peaceful • Schooling • Active

Best kept in groups of 6 or more. Males may display mild territorial behavior toward one another, especially during courtship, but serious aggression is uncommon.

Diet

Omnivore

Readily accepts:

• Quality flakes and pellets
• Frozen foods
• Live foods
• Daphnia
• Baby brine shrimp
• Bloodworms

Did You Know?

Male Emperor Tetras develop elongated tail filaments and can change the color of their eyes from blue to green depending on their mood, social interactions, and lighting conditions.

Ideal Water Parameters

• GH: 2–12
• KH: 1–6
• Flow: Low to moderate
• Planted Aquarium: Recommended
• Group Size: 6+ individuals

Compatibility

✅ Corydoras
✅ Rasboras
✅ Dwarf Cichlids
✅ Hatchetfish
✅ Peaceful Rainbowfish

⚠️ Avoid large aggressive fish
⚠️ Best coloration develops in subdued lighting

Why This Species Is Special

• Iridescent blue and purple body coloration
• Distinctive black lateral stripe
• Elegant extended tail filaments in males
• Peaceful and easy to keep
• Excellent centerpiece fish for community aquariums

The Emperor Tetra is one of the most elegant and underrated tetras in the hobby. Its regal appearance, shimmering colors, and graceful swimming behavior make it a standout addition to planted and community aquariums alike. 👑🐟