Golden Pencilfish
Nannostomus sp.
Golden Pencilfish (Nannostomus sp.) — Varies care, Peaceful, under Other. Minimum tank in the app: 18.5 US gal min; aim for 70–81°F and pH 6.5–7.5. The Golden Pencilfish is a captivating choice for aquarists seeking a distinctive mid-water swimmer with intriguing behaviours.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
South America
- South America
Regional colours match the stocking calculator’s origin map.
Golden Pencilfish Tank Setup
Create a balanced environment that incorporates open swimming areas alongside structured hiding spots. Utilize a gentle water flow and fine substrate to mimic their natural habitat, while dim lighting can help reduce stress and encourage natural behaviours. A diverse layout with plants and decorations will promote exploration and comfort.
What Do Golden Pencilfishs Eat?
Feeding is generally competitive but manageable, as they are omnivorous and will accept a range of foods. Offering smaller particles or high-quality flake food can prevent larger fish from dominating.
Golden Pencilfish Tank Mates
Golden Pencilfish pair well with similarly sized, non-aggressive species that occupy different swimming zones to minimize conflict. Larger or overly boisterous tank mates may stress them, so avoid aggressive cichlids or large barbs. Intraspecies interactions can vary, necessitating observation to ensure a harmonious group dynamic.
Are Golden Pencilfishs Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate their social needs, leading to isolation stress when kept alone. neglecting to provide sufficient cover can exacerbate their skittishness, resulting in decreased feeding and increased territorial disputes.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




