Common name
Bristlenose pleco
Scientific name
Ancistrus cf. cirrhosus
Category
Freshwater fish
Group
Plecos and suckermouth catfish
Environment
Mature freshwater aquarium with wood, smooth caves, shaded hard surfaces, high oxygen and strong biological filtration
Origin
Domestic aquarium lines commonly sold under Ancistrus cf. cirrhosus; exact wild ancestry is often undocumented
Care level
Easy to intermediate
Adult size
Usually about 10–15 cm total length depending on line and identity
Expected lifespan
About 8–12 years with good care; individual records vary
Minimum housing
At least 100 L with an 80 cm or longer footprint for one adult; larger for multiple adults
Temperature
23–27 °C
pH
6.0–7.8
Hardness / minerals
Soft to moderately hard; avoid abrupt mineral changes
Salinity
Freshwater, 0 ppt; routine salt addition is not recommended
Lighting
Subdued to moderate with shaded caves and some algae-growing surfaces
Placement / swimming zone
Bottom and hard surfaces

Identity and search names

Domestic trade-form profile for bristlenose plecos commonly labelled Ancistrus cf. cirrhosus. Exact species or lineage should be retained when documented. Search names: Bushynose pleco, Bristlenose catfish, Ancistrus cirrhosus trade form

Environment and housing

Wood, smooth caves, rounded hardscape, shaded surfaces, strong filtration, high oxygen and guarded intakes

Feeding and nutrition

Feeding ecology: Biofilm, algae, detritus and plant-rich foods with some invertebrate protein; it cannot live on tank algae or waste alone

Feeding routine: Offer measured sinking algae-rich food and vegetables regularly, with occasional protein; remove leftovers before they foul

Breeding and reproduction

The female lays adhesive eggs in a cave and the male guards and fans them until the fry leave

Parental care: Male guards eggs and newly hatched fry in the cave

System demands

Filtration: Use mature biological filtration sized for the adult stock and feeding load, with guarded intakes and a flow pattern the species can use without continual effort.

Aeration: Maintain strong gas exchange and stable dissolved oxygen, especially overnight, during warm weather, medication, crowding or any interruption to filtration.

Maintenance: Test ammonia and nitrite after changes or abnormal behaviour; remove waste from the occupied zone and perform regular water changes matched to temperature and mineral chemistry.

Detailed husbandry

Identity scope
Domestic trade-form profile for bristlenose plecos commonly labelled Ancistrus cf. cirrhosus. Exact species or lineage should be retained when documented.
Adult size and space
Usually about 10–15 cm total length depending on line and identity. At least 100 L with an 80 cm or longer footprint for one adult; larger for multiple adults. Adult dimensions, activity and social structure matter more than sale size.
Social structure
One adult or a compatible group with more caves and feeding sites than fish
Swimming zone
Primary zone: Bottom and hard surfaces. Keep that zone usable and provide escape routes, feeding access and uninterrupted movement appropriate to the species.
Feeding ecology
Biofilm, algae, detritus and plant-rich foods with some invertebrate protein; it cannot live on tank algae or waste alone
Feeding plan
Offer measured sinking algae-rich food and vegetables regularly, with occasional protein; remove leftovers before they foul
Water stability
Maintain 23–27 °C; pH: 6.0–7.8; hardness/minerals: Soft to moderately hard; avoid abrupt mineral changes. Stable temperature, oxygen and nitrogen-cycle control matter more than chasing unsupported exact numbers.
Habitat structure
Wood, smooth caves, rounded hardscape, shaded surfaces, strong filtration, high oxygen and guarded intakes
Compatibility plan
Avoid aggressive bottom fish and ensure each pleco has direct feeding access and a secure cave
Breeding plan
The female lays adhesive eggs in a cave and the male guards and fans them until the fry leave. Parental care: Male guards eggs and newly hatched fry in the cave. Do not trigger reproduction without capacity for aggression, eggs or fry and lawful rehoming.
Quarantine
Quarantine in a separate cycled aquarium with dedicated nets, containers and siphons. Match temperature and mineral chemistry gradually, confirm normal feeding, respiration, skin, fins and waste, and never pour transport water into the established aquarium.
Welfare checks
Check belly fullness, eyes, mouth and barbel condition, faeces, cave access, respiration and night-time feeding
Biosecurity and release
Never release fish, fry, eggs, aquarium water, sediment, plants or foods into drains, dams or natural waterways. Check the exact accepted identity in current BICON and applicable South Australian rules before import, sale or movement; import eligibility does not authorise release or wild collection.
Main risk
“Bristlenose” is often a domestic trade complex rather than a verified wild species. Wood is valuable habitat and grazing surface, but it does not replace a balanced diet.
Adult projected load
Plan biological load around Usually about 10–15 cm total length depending on line and identity, adult activity, One adult or a compatible group with more caves and feeding sites than fish, feeding and waste production rather than the size of juveniles offered for sale.
Filtration
Provide mature biological capacity for the full adult group, keep intakes safe, and direct return flow so shelter, feeding and swimming areas remain usable.
Aeration
Provide continuous surface movement or supplementary aeration sufficient for the full adult group; increase oxygen support during heat, treatment, spawning or filter disruption.
Maintenance
Use measured water changes, substrate cleaning appropriate to the habitat, filter servicing without destroying the biofilm, and routine checks of nitrate, temperature and mineral stability.
Overridable warnings
Override only with documented adult-capacity filtration, oxygen measurements and a tested maintenance plan. The warning remains active when the trigger is present: “Bristlenose” is often a domestic trade complex rather than a verified wild species. Wood is valuable habitat and grazing surface, but it does not replace a balanced diet.

Welfare and risk

Main risk

“Bristlenose” is often a domestic trade complex rather than a verified wild species. Wood is valuable habitat and grazing surface, but it does not replace a balanced diet.

Check belly fullness, eyes, mouth and barbel condition, faeces, cave access, respiration and night-time feeding

Sources