Bristlenose Pleco
Ancistrus hoplogenys
A peaceful, algae-grazing bristlenose from the Amazon with an unusual breathing trick.

About
Found across a broad sweep of South American river systems including the Amazon, Essequibo, and Paraguay basins, as well as Suriname, this bristlenose pleco, Ancistrus hoplogenys, is one of those solid, unfussy bottom-dwellers that earns its keep in a planted or community setup. It shares the characteristic bushy tentacles on the snout that make ancistrus species so recognizable, and grows to a manageable size that won't overwhelm a mid-sized aquarium. One genuinely interesting biological quirk is its capacity for air-breathing. It can supplement gill respiration by gulping atmospheric air, an adaptation that likely helps it cope with the low-oxygen, slow-moving, or seasonally variable waters it inhabits in the wild. Day to day it tends to stay out of sight, becoming more active after lights-out when it goes to work grazing surfaces and foraging along the substrate. Temperament is reliably peaceful, making it a good fit alongside most community fish. A diet heavy in plant matter, algae, vegetables, and quality sinking wafers, is important for long-term health. It sits in the intermediate care category mainly because it appreciates good water quality and a well-maintained tank rather than having any particularly demanding requirements.
Similar species
Other fish you might consider
Good tank mates
Species that tend to coexist peacefully with Bristlenose Pleco
From the same region
Share the same natural habitat. Great for a biotope-themed tank
Frequently asked questions
- How big does the Bristlenose Pleco get?
- The Bristlenose Pleco reaches about 3.5–6" as an adult.
- What size tank does the Bristlenose Pleco need?
- A minimum of 30 gallons is recommended for the Bristlenose Pleco.
- What water parameters does the Bristlenose Pleco need?
- The Bristlenose Pleco does best with a temperature of 72–82°F, a pH of 5.5–7.5, hardness around 2–20 dGH.
- Is the Bristlenose Pleco aggressive?
- The Bristlenose Pleco is generally peaceful and suits a community tank with similarly calm tankmates.
- What does the Bristlenose Pleco eat?
- The Bristlenose Pleco is a herbivore. It needs a plant-based diet such as algae, blanched vegetables, or spirulina-based foods.
- How long does the Bristlenose Pleco live?
- With good care, the Bristlenose Pleco typically lives 5-8 years.