Red Pencilfish ML – Nannostomus beckfordi

Red Pencilfish ML, scientifically known as Nannostomus beckfordi, is a graceful and colorful nano fish admired for its slender body, horizontal striping, and warm red to bronze tones. Native to South American river systems, this species is a popular choice for aquarists who appreciate elegant, subtle beauty and natural swimming behavior.

The “ML” size refers to medium-large specimens, typically well-grown individuals that display stronger coloration and more defined patterns. Red Pencilfish are known for their slightly angled swimming posture, often gliding through the water at a gentle upward angle, which adds a unique visual element to the aquarium.

Unlike many schooling fish, Red Pencilfish exhibit loose group behavior rather than tight schooling, creating a more natural and relaxed movement pattern in planted tanks. Their peaceful temperament makes them suitable for nano to medium community aquariums.

Key Features

• Known as Red Pencilfish (Nannostomus beckfordi)

• Slender body with horizontal stripe and red tones

• “ML” size – medium-large, well-developed fish

• Unique angled swimming posture

• Peaceful and community friendly

• Ideal for planted aquariums and aquascapes

Size

• Adult size: 4 – 5 cm

• “ML” specimens are typically 3.5 – 4.5 cm

• Slim, elongated body shape

Temperament

Red Pencilfish ML is peaceful with mild social interactions.

• Best kept in groups of 6–10 or more

• Males may show mild territorial displays

• Calm mid to upper water swimmer

• Suitable for peaceful community tanks

Water Conditions

Stable water helps maintain coloration and health.

• Temperature: 24 – 28°C (75 – 82°F)

• pH: 5.5 – 7.5

• GH: 2 – 10 dGH

• Ammonia/Nitrite: 0 ppm

• Nitrate: < 20 ppm

Perform 20–30% weekly water changes.

Tank Setup

Red Pencilfish thrive in planted aquariums.

Recommended setup includes:

• Dense plants along edges

• Open swimming space

• Floating plants for cover

• Driftwood and natural décor

• Gentle water flow

Minimum tank size: 60 liters (~15 gallons).

Feeding Habits

Red Pencilfish ML are omnivores.

Diet can include:

• Micro pellets or flakes

• Frozen foods (daphnia, brine shrimp)

• Live foods for better coloration

Feed 1–2 times daily in small portions.

Tank Mates

Ideal for peaceful community aquariums.

Suitable tank mates:

• Small tetras

• Rasboras

• Corydoras

• Dwarf cichlids

• Shrimp (with caution)

Tank mates to avoid:

• Aggressive fish

• Fast fin-nippers

Care and Maintenance

To keep Red Pencilfish healthy:

• Keep in groups for natural behavior

• Maintain stable water conditions

• Provide plants and shaded areas

• Perform regular water changes

• Feed a balanced diet

With proper care, they can live 4–5 years.

Why Choose Red Pencilfish ML?

• Elegant slender body with red tones

• Unique angled swimming behavior

• Peaceful and easy to keep

• Ideal for planted aquariums

• Adds subtle beauty and movement

Red Pencilfish ML is a refined and calming species that brings natural elegance, gentle movement, and soft coloration to aquariums. Its unique swimming style and peaceful nature make it a perfect addition to planted and community tanks. 🐟🌿