Nannostomus beckfordi — Golden Red Pencilfish
Family: Lebiasinidae
Origin: Slow-moving waters of the Amazon Basin and other parts of northern South America (Guyana, Suriname, Brazil)
Size: 4–5 cm (1.5–2 inches)
Lifespan: 3–5 years
 
Natural Habitat
Environment: Shallow, tannin-rich forest streams and flooded areas with dense aquatic vegetation
Water Conditions: Soft, acidic blackwater with leaf litter and low flow
Temperature Range: 24–28°C (75–82°F)
 
Physical Description
Body Shape: Slender and elongated with a slightly flattened belly
Coloration:
Males: Golden-bronze body with a bold horizontal black stripe and red highlights in fins and caudal area
Females: Less vivid coloration, more transparent fins
Fins: Small and often reddish in males, particularly the anal and tail fins
 
Aquarium Care
Tank Size: Minimum 40 litres (10 gallons); larger preferred for groups
Water Parameters:
pH: 5.5–7.0
Temperature: 24–28°C (75–82°F)
Water Flow: Gentle
Substrate: Dark sand or fine gravel
Décor: Heavily planted tank with floating plants, driftwood, and leaf litter; subdued lighting enhances colour
Filtration: Gentle filtration to simulate natural habitat
 
Diet
Type: Omnivorous
Preferred Foods: Micropellets, crushed flakes, and live or frozen foods (daphnia, brine shrimp, micro worms)
Feeding Frequency: 2–3 small meals per day
 
Behavior & Tank Mates
Temperament:
Peaceful and best kept in groups of 6 or more
Displays shoaling behavior, especially in the presence of mild current
Compatible Tank Mates:
Other small, peaceful fish (Tetras, Rasboras, Corydoras)
Avoid large or aggressive species
Behavior Notes:
Males often display to each other by flaring fins and circling
 
Breeding
Spawning Method: Egg scatterer
Breeding Conditions:
Soft, acidic water; fine-leaved plants or spawning mops helpful
Adults may consume eggs, so separation is recommended
Fry Care:
Feed with infusoria or powdered fry food after hatching