Can harlequin rasboras and chili rasboras live together?

Yes

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

Harlequin rasbora Chili rasbora

Why

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

What each one needs

Harlequin rasboraChili rasboraBoth
Temperature72–80°F (22–27°C)68–82°F (20–28°C)72–80°F (22–27°C)
pH6.0–7.54.0–7.06.0–7.0
Minimum tank10 gal (38 L)5 gal (19 L)10 gal (38 L)
Keep at least66
Adult size1.8 in (4.6 cm)0.7 in (1.8 cm)

The smallest tank for both

A 10 gallons (38 L) tank holds 6 harlequin rasboras and 6 chili rasboras at about 78% of its stocking limit, which leaves room for more.

Other tank mates for harlequin rasboras

Other tank mates for chili rasboras