What Size Tank Does a Bristlenose Pleco Need?
Minimum tank: 29 gallons
A Bristlenose Pleco (Ancistrus cirrhosus) grows to about 5 in (12.7 cm), so the practical minimum is a 29-gallon aquarium. The Bristlenose Pleco is best kept singly, so the minimum is about giving one fish enough territory.
| Single fish or pair | 29 gallons |
|---|---|
| Comfortable group | 29 gallons |
| Community setup | 39 gallons+ |
Bigger is easier: more water dilutes waste and holds temperature and pH steady. See stocking ideas for a 29-gallon tank or try the stocking calculator.
Frequently asked questions
What is the minimum tank size for a Bristlenose Pleco?
At least 29 gallons.
Can a Bristlenose Pleco live in a smaller tank?
Going under 29 gallons stresses the fish, worsens water quality and shortens its life — not recommended.
More on this species: Bristlenose Pleco full care guide · tank size · temperature · pH & hardness · tank mates