Beckford’s Pencilfish: A Comprehensive Care Guide (Nannostomus beckfordi)
The Beckford’s Pencilfish (Nannostomus beckfordi) is one of the most commonly kept and recognizable species of pencilfish in the aquarium hobby. Native to South America, this peaceful species is known for its slender body, horizontal stripe, and subtle golden coloration.
Compared to some other pencilfish species, Beckford’s Pencilfish are slightly larger and more active swimmers. They display a striking black horizontal stripe running along the length of the body, often accompanied by reddish tones in the fins and tail.
Because of their hardy nature and peaceful temperament, Beckford’s Pencilfish are a popular choice for planted aquariums and South American community tanks.
Natural Habitat and Distribution
Beckford’s Pencilfish originate from South America, particularly within parts of the Amazon and Orinoco river basins, including regions of Brazil, Guyana, Suriname, and Venezuela.
In the wild they are commonly found in:
-
Slow-moving forest streams
-
Blackwater tributaries
-
Flooded forest habitats
-
Calm waters with dense vegetation and leaf litter
These environments typically contain soft, slightly acidic water and subdued lighting from overhanging vegetation.
Size
Adult size: approximately 2–2.5 inches (5–6 cm)
Beckford’s Pencilfish are slightly larger than many other pencilfish species, which makes them a bit easier to observe in aquariums.
Tank Size
Minimum tank size: 15 gallons
Recommended tank size: 20 gallons or larger
Beckford’s Pencilfish should be kept in groups of at least 6–8 individuals, though larger groups often display more natural behavior.
A longer aquarium provides ample space for swimming and social interactions.
Water Parameters
Beckford’s Pencilfish prefer stable water conditions similar to those found in their natural habitat.
Temperature: 72–80°F
pH: 5.5–7.5
Hardness: soft to moderately soft
Maintaining clean water and performing regular water changes will help keep them healthy.
Aquarium Setup
A planted aquarium with natural decorations works very well for Beckford’s Pencilfish.
Recommended tank features include:
-
Dense aquatic plants
-
Floating plants to provide shade
-
Driftwood and natural decorations
-
Dark substrate
Providing both plant cover and open swimming space allows them to display natural behaviors.
Diet
Beckford’s Pencilfish are omnivorous micro-predators that feed on small foods.
In the aquarium they will accept:
-
High-quality flakes
-
Nano pellets
-
Frozen foods such as brine shrimp or daphnia
-
Small live foods
A varied diet helps maintain good health and vibrant coloration.
Behavior and Temperament
Beckford’s Pencilfish are peaceful and active fish that typically swim in the middle and upper levels of the aquarium.
Typical behaviors include:
-
Loose schooling in groups
-
Occasional displays between males
-
Active swimming through open areas of the tank
Although generally peaceful, males may occasionally spar with one another, especially in smaller groups.
Tank Mates
Beckford’s Pencilfish work well with other peaceful community fish.
Good tank mates include:
-
Small tetras
-
Rasboras
-
Corydoras
-
Dwarf shrimp
-
Other peaceful nano fish
Avoid aggressive fish or species that may prey on them.
Breeding
Beckford’s Pencilfish are egg-scattering fish that may spawn in well-planted aquariums.
During spawning:
-
Eggs are scattered among plants or moss
-
Adults do not guard the eggs
-
Eggs typically hatch within 24–48 hours
The fry are extremely small and require infusoria or powdered fry foods before transitioning to baby brine shrimp.
Fun Facts
-
Beckford’s Pencilfish is one of the most widely distributed pencilfish species in South America.
-
Males often develop more intense coloration than females.
-
Their slender body shape and horizontal stripe give them the classic “pencilfish” appearance.
Conclusion
The Beckford’s Pencilfish (Nannostomus beckfordi) is a hardy and attractive species that works well in planted aquariums and peaceful community tanks. Their subtle coloration, active behavior, and manageable size make them a great introduction to the fascinating pencilfish family. With proper care and stable water conditions, Beckford’s Pencilfish can thrive and add lively movement to freshwater aquariums.
Looking to Add Fish to Your Aquarium?
If you're looking to add new fish to your aquarium, we recommend purchasing from trusted retailers known for their healthy livestock and excellent selection. The Wet Spot Tropical Fish has one of the best selections of rare and high-quality freshwater fish in the hobby, with excellent shipping and consistently healthy stock. Moonlight Aquatics is another fantastic source, especially for uncommon species and great prices on unique fish you don’t see everywhere. If you’re looking to add shrimp to your tanks, Buy Pet Shrimp specializes in hardy, well-bred freshwater shrimp that ship safely and arrive in great condition.
Use our affiliate links and discount codes to save a little:
The Wet Spot Tropical Fish
https://geni.us/WCZYWC
Use code steenfott10 for 10% off
Moonlight Aquatics
https://geni.us/pAFf1s
Use code steenfott10 for 10% off
Buy Pet Shrimp
https://geni.us/RNkIQpf
Use code steenfott5 for 5% off
Your support helps us continue creating guides and content for the aquarium hobby.