Green Widow Tetra

Overview

The Black Skirt / Widow Tetra (Gymnocorymbus ternetzi) is a larger, robust schooling tetra available in multiple trade forms (Black, White, Blue, Purple, Green Widow). Its distinctive striped body and hardy nature make it popular for community tanks.

Water Parameters

• Temperature: 20–26°C (68–79°F)
• pH: 6.0–7.5
• Hardness: 5–18 dGH (very adaptable)

Tank Setup

• Minimum tank size: 75 litres for 6+
• Decor: Planted with open swimming space; they occupy mid-water

Diet

• Base: Quality flake, granules
• Treats: Frozen bloodworms, brine shrimp, daphnia

Temperament & Tank Mates

• Temperament: Peaceful but may nip fins in small groups
• Best companions: Other robust tetras, barbs, corydoras, gouramis
• Avoid: Very small or long-finned fish
• Schooling: Minimum 6; larger groups reduce fin-nipping

Breeding

• Difficulty: Easy; scatter spawner
• Process: Fine-leaved plants; remove parents

Common Issues

• Hardy; suitable for beginners
• Grows to 5–6 cm; plan tank mates accordingly
• Lifespan: 3–5 years