Red Pencil Tetra - L size (Single) (Copy)

The Red Pencil Tetra (Nannostomus mortenthaleri) is a stunning, slender freshwater fish prized for its vibrant red and black coloration and peaceful nature. Its elongated body and rich hue make it a standout in planted community aquariums.

Native to South America, especially Peru’s waterways, this species is a true jewel in nano and community tanks alike.

Key Features

• Scientific Name: Nannostomus mortenthaleri

• Common Names: Red Pencil Tetra, Coral Red Pencilfish, Ruby Red Pencilfish

• Size: Up to ~3 cm (about 1.2 inches) as an adult

• Temperament: Peaceful, ideal for calm community setups

• Tank Level: Mid to upper water column

• Color & Markings: Rich red body with darker accents and a sleek pencil-like shape that glimmers in planted environments

• Lifespan: ~3–5 years with proper care

• Water Parameters:

  • Temperature: ~22–27 °C (72–81 °F)

  • pH: ~6.0–7.5

• Diet: Omnivore – enjoys high-quality flakes, micro pellets, and occasional live/frozen foods like daphnia and brine shrimp

• Care Level: Easy to moderate — best kept in schools (6 + individuals)