Can chili rasboras live with harlequin rasboras?

Verdict
Yes

Yes. Chili rasboras and harlequin rasboras make a good pair. Both are fine at 75–80°F. Plan on at least 10 gal.

Chili rasboraChili rasbora75–82°F · pH 4–7 Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Chili rasbora 75–82°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Both: 6–7Chili rasbora 4–7Harlequin rasbora 6–7.5
The green band is the pH both tolerate.

Size to scale

Chili rasbora · 0.8 inHarlequin rasbora · 2 in0"1"2"3"4"5"6"
Adult length in an aquarium. A fish can swallow anything that fits in its mouth, roughly a third to half its own length for predators.

Care at a glance

Chili rasboraHarlequin rasbora
Temperature75–82 °F72–80 °F
pH4–76–7.5
Adult size0.8 in2.0 in
Minimum tank5 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 8+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for chili rasboras

All chili rasbora tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can chili rasboras live with harlequin rasboras?

Yes. Chili rasboras and harlequin rasboras make a good pair. Both are fine at 75–80°F. Plan on at least 10 gal.

What temperature suits both chili rasboras and harlequin rasboras?

75–80 °F. Chili rasboras need 75–82 °F, harlequin rasboras need 72–80 °F.

What size tank do chili rasboras and harlequin rasboras need together?

At least 10 gal, set by the harlequin rasbora. Add space for each extra fish.