What Size Tank Does a Discus Need?
Minimum tank: 55 gallons
A Discus (Symphysodon aequifasciatus) grows to about 8 in (20.3 cm), so the practical minimum is a 55-gallon aquarium. A pair or small group is typical, so leave a little extra room for tankmates.
| Single fish or pair | 55 gallons |
|---|---|
| Comfortable group | 55 gallons |
| Community setup | 65 gallons+ |
Bigger is easier: more water dilutes waste and holds temperature and pH steady. See stocking ideas for a 55-gallon tank or try the stocking calculator.
Frequently asked questions
What is the minimum tank size for a Discus?
At least 55 gallons.
Can a Discus live in a smaller tank?
Going under 55 gallons stresses the fish, worsens water quality and shortens its life — not recommended.
More on this species: Discus full care guide · tank size · temperature · pH & hardness · tank mates