🐟 Peruvian Red Pencilfish (Nannostomus mortenthaleri) – Vibrant Nano Schooling Fish

Description: The Peruvian Red Pencilfish (Nannostomus mortenthaleri), also known as the Coral Red Pencilfish, is one of the most striking species of pencilfish. With its bright red body, dark horizontal stripes, and peaceful nature, this nano schooling fish makes a brilliant addition to planted and community aquariums. Originating from Peru’s blackwater streams, these fish thrive in well-planted aquariums with soft, slightly acidic water and are best kept in groups of 8 or more to encourage their natural shoaling behavior.

Care Information

• Scientific Name: Nannostomus mortenthaleri
• Common Name: Peruvian Red Pencilfish, Coral Red Pencilfish
• Care Level: Moderate
• Temperament: Peaceful, schooling
• Max Size: ~1.5 inches (4 cm)
• Tank Size: Minimum 15–20 gallons
• Diet: Omnivorous – micro pellets, flakes, frozen/live foods (daphnia, baby brine shrimp, cyclops)
• Water Parameters:
• Temperature: 74–82°F (23–28°C)
• pH: 5.5–7.0
• Soft, slightly acidic water preferred

❓ FAQ

Q: Are Peruvian Red Pencilfish peaceful?
A: Yes, they are very peaceful nano schooling fish, ideal for community aquariums.

Q: How many should I keep together?
A: At least 8 or more to see their best coloration and shoaling behavior.

Q: Are they safe with shrimp?
A: Yes, adult shrimp are safe, though tiny shrimp fry may be eaten.

Q: Do they need live plants?
A: They thrive in planted aquariums with dark substrate and gentle filtration.