Can rosy barbs live with gold barbs?

Verdict
Yes

Yes. Rosy barbs and gold barbs make a good pair. Both are fine at 64–75°F. Plan on at least 30 gal.

Rosy barbRosy barb64–77°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: 64–75°Rosy barb 64–77°Gold barb 64–75°
The green band is the temperature range both can live in.
456789Both: 6–7.5Rosy barb 6–7.5Gold barb 6–8
The green band is the pH both tolerate.

Size to scale

Rosy barb · 4 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

Rosy barbGold barb
Temperature64–77 °F64–75 °F
pH6–7.56–8
Adult size4.0 in3.0 in
Minimum tank30 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for rosy barbs

All rosy barb tank mates

Better tank mates for gold barbs

All gold barb tank mates

Questions

Can rosy barbs live with gold barbs?

Yes. Rosy barbs and gold barbs make a good pair. Both are fine at 64–75°F. Plan on at least 30 gal.

What temperature suits both rosy barbs and gold barbs?

64–75 °F. Rosy barbs need 64–77 °F, gold barbs need 64–75 °F.

What size tank do rosy barbs and gold barbs need together?

At least 30 gal, set by the rosy barb. Add space for each extra fish.