Nannostomus rubrocaudatus – Purple Pencilfish

✨ Nannostomus rubrocaudatus – Purple Pencilfish

📖 Overview The Purple Pencilfish (Nannostomus rubrocaudatus) is one of the most striking pencilfish species, prized for its vibrant purple-red body, horizontal stripe, and vivid red tail. Native to the clearwater streams of Peru, this small schooling fish is a favorite among aquascapers and nano aquarium keepers. Peaceful, active, and full of color, it thrives in well-planted aquariums with soft, clean water.

🌟 Key Features

• ✅ Rare & Colorful: Bright purple-red body with glowing accents
• ✅ Schooling Fish: Best kept in groups of 8+
• ✅ Nano-Friendly: Perfect for planted aquariums 15 gallons or larger
• ✅ Peaceful & Active: Excellent for community setups
• ✅ Aquascaping Favorite: Pops against lush green plants and blackwater setups

📐 Care Quick Facts

• Scientific Name: Nannostomus rubrocaudatus
• Common Name: Purple Pencilfish
• Origin: Peru (Nanay River basin)
• Size: 1.5–2 inches
• Lifespan: 3–5 years
• Temperament: Peaceful schooling fish
• Tank Size: 15+ gallons
• Water Parameters:
• Temperature: 74–80°F
• pH: 5.5–7.0 (soft, slightly acidic)
• Hardness: Soft water preferred
• Diet: Micropellets, flakes, frozen/live foods (daphnia, cyclops, baby brine shrimp)

🧠 Behavior & Tank Mates

• Schooling: Keep at least 8–10 for best display and reduced stress.
• Tank Mates: Small rasboras, tetras, corydoras, dwarf shrimp, and peaceful nano fish.
• Avoid: Large or aggressive species that may outcompete them for food.

❓ FAQ

Q: Are Purple Pencilfish good for planted aquariums?
A: Yes! Their shimmering purple coloration looks stunning against green plants and dark substrates.

Q: Do they require soft water?
A: They prefer soft, slightly acidic water but can adapt to neutral conditions if stable.

Q: Can they be kept alone?
A: No, they are schooling fish and must be kept in groups for health and natural behavior.