What Size Tank Does a Rosy Barb Need?
Minimum tank: 30 gallons
A Rosy Barb (Pethia conchonius) grows to about 2.5 in (6.3 cm), so the practical minimum is a 30-gallon aquarium. Because the Rosy Barb is a schooling fish, keep at least 6 together — a shoal needs more swimming room than one fish, so size up for a full group plus tankmates.
| Single fish or pair | 30 gallons |
|---|---|
| Comfortable group | 40 gallons |
| Community setup | 40 gallons+ |
Bigger is easier: more water dilutes waste and holds temperature and pH steady. See stocking ideas for a 40-gallon tank or try the stocking calculator.
Frequently asked questions
What is the minimum tank size for a Rosy Barb?
At least 30 gallons. Keep a group of 6+, which prefers something larger.
Can a Rosy Barb live in a smaller tank?
Going under 30 gallons stresses the fish, worsens water quality and shortens its life — not recommended.
More on this species: Rosy Barb full care guide · tank size · temperature · pH & hardness · tank mates