Can cherry barbs live with harlequin rasboras?

Verdict
Yes

Yes. Cherry barbs and harlequin rasboras get along in the same tank. Both are fine at 73–80°F. Plan on at least 20 gal.

Cherry barbCherry barb73–81°F · pH 6–7.5 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: 73–80°Cherry barb 73–81°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Both: 6–7.5Cherry barb 6–7.5Harlequin rasbora 6–7.5
The green band is the pH both tolerate.

Size to scale

Cherry barb · 2 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

Cherry barbHarlequin rasbora
Temperature73–81 °F72–80 °F
pH6–7.56–7.5
Adult size2.0 in2.0 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for cherry barbs

All cherry barb tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can cherry barbs live with harlequin rasboras?

Yes. Cherry barbs and harlequin rasboras get along in the same tank. Both are fine at 73–80°F. Plan on at least 20 gal.

What temperature suits both cherry barbs and harlequin rasboras?

73–80 °F. Cherry barbs need 73–81 °F, harlequin rasboras need 72–80 °F.

What size tank do cherry barbs and harlequin rasboras need together?

At least 20 gal, set by the cherry barb. Add space for each extra fish.