Can harlequin rasboras and tiger barbs live together?

Yes

Harlequin rasboras and tiger barbs can share a tank. Their water needs overlap and neither is known to bother the other.

Harlequin rasbora Tiger barb

Why

  • Their temperature and pH ranges overlap comfortably, and neither is known to nip, chase or eat the other.

What each one needs

Harlequin rasboraTiger barbBoth
Temperature72–80°F (22–27°C)68–79°F (20–26°C)72–79°F (22–26°C)
pH6.0–7.56.0–7.56.0–7.5
Minimum tank10 gal (38 L)20 gal (76 L)20 gal (76 L)
Keep at least66
Adult size1.8 in (4.6 cm)2.8 in (7.1 cm)

The smallest tank for both

A 29 gallons (110 L) tank holds 6 harlequin rasboras and 6 tiger barbs at about 62% of its stocking limit, which leaves room for more.

Other tank mates for harlequin rasboras

Other tank mates for tiger barbs