Longfin Common Bristlenose
Ancistrus sp.
 
The Longfin Common Bristlenose is a popular and hardy pleco species, prized for its algae-eating ability and flowing, elegant finnage. A variant of the standard Bristlenose Pleco, this fish has extended tail and pectoral fins, giving it a graceful appearance as it glides along the aquarium glass or decor. Males develop distinctive facial bristles, while females remain smoother-faced.
Bristlenose plecos are peaceful bottom dwellers that help control algae growth and thrive in a wide range of water conditions. They're ideal for community tanks and are much more manageable in size compared to larger plecos like the Common or Sailfin varieties.
 
Species Overview
Common Name: Longfin Common Bristlenose
Scientific Name: Ancistrus sp.
Origin: South America (tank-bred variant)
Maximum Size: 12–14 cm
Lifespan: 5–10 years
Temperament: Peaceful
Swimming Level: Bottom
Compatibility: Excellent with most peaceful species
 
Aquarium Requirements
Minimum Tank Size: 80 litres
Substrate: Sand or smooth gravel
Décor: Driftwood, rocks, caves for hiding
Plants: Safe with most – may graze algae from leaves
Lighting: Low to moderate
Filtration: Moderate flow preferred
Tank Cover: Recommended – they can jump if startled
 
Water Parameters
Temperature: 22–28°C
pH: 6.5–7.5
Hardness: Soft to moderately hard (3–15 dGH)
Water Movement: Moderate
 
Diet
Diet Type: Herbivore (with some omnivorous needs)
Preferred Foods:
– Algae wafers and sinking veggie pellets
– Blanched vegetables: zucchini, cucumber, pumpkin, spinach
– Occasional protein: bloodworms or brine shrimp
Feeding Frequency: 1–2 times daily
Feeding Tips: Always include vegetable matter and driftwood for digestion
 
Breeding
Cave spawners
Males guard eggs laid inside a cave or tube
Fry are easy to raise with proper food and clean water
Sexual dimorphism: Males develop bristles on their snout
 
Care Summary
Care Level: Easy
Temperament: Peaceful
Adult Size: 12–14 cm
Tank Size: 80 litres or more
Water Temperature: 22–28°C
pH Range: 6.5–7.5
 
Diet: Primarily vegetarian – wafers, blanched vegetables
Breeding: Cave spawner – male guards eggs
Tankmates: Peaceful community fish, tetras, rasboras, Corydoras, dwarf cichlids