Can goldfish live with rosy barbs?

Verdict
Yes

Yes. Goldfish and rosy barbs make a good pair. Both are fine at 64–74°F. Plan on at least 40 gal.

GoldfishGoldfish60–74°F · pH 7–8 Rosy barbRosy barb64–77°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 64–74°Goldfish 60–74°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 7–7.5Goldfish 7–8Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Goldfish · 10 inRosy barb · 4 in0"2"4"6"8"10"
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

GoldfishRosy barb
Temperature60–74 °F64–77 °F
pH7–86–7.5
Adult size10.0 in4.0 in
Minimum tank40 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atAll levelsMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for goldfish

All goldfish tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can goldfish live with rosy barbs?

Yes. Goldfish and rosy barbs make a good pair. Both are fine at 64–74°F. Plan on at least 40 gal.

What temperature suits both goldfish and rosy barbs?

64–74 °F. Goldfish need 60–74 °F, rosy barbs need 64–77 °F.

What size tank do goldfish and rosy barbs need together?

At least 40 gal, set by the goldfish. Add space for each extra fish.