Can harlequin rasboras live with gold barbs?

Verdict
Yes

Yes, harlequin rasboras and gold barbs can live together. Both are fine at 72–75°F. Plan on at least 20 gal.

Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5 Gold barbGold barb64–75°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–75°Harlequin rasbora 72–80°Gold barb 64–75°
The green band is the temperature range both can live in.
456789Both: 6–7.5Harlequin rasbora 6–7.5Gold barb 6–8
The green band is the pH both tolerate.

Size to scale

Harlequin rasbora · 2 inGold barb · 3 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

Harlequin rasboraGold barb
Temperature72–80 °F64–75 °F
pH6–7.56–8
Adult size2.0 in3.0 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Better tank mates for gold barbs

All gold barb tank mates

Questions

Can harlequin rasboras live with gold barbs?

Yes, harlequin rasboras and gold barbs can live together. Both are fine at 72–75°F. Plan on at least 20 gal.

What temperature suits both harlequin rasboras and gold barbs?

72–75 °F. Harlequin rasboras need 72–80 °F, gold barbs need 64–75 °F.

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

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