Can fancy goldfish live with gold barbs?

Verdict
Yes

Yes. Fancy goldfish and gold barbs make a good pair. Both are fine at 65–74°F. Plan on at least 30 gal.

Fancy goldfishFancy goldfish65–74°F · pH 7–8 Gold barbGold barb64–75°F · pH 6–8

Why it works

Water side by side

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

Size to scale

Fancy goldfish · 6 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

Fancy goldfishGold barb
Temperature65–74 °F64–75 °F
pH7–86–8
Adult size6.0 in3.0 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atAll levelsMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for fancy goldfish

All fancy goldfish tank mates

Better tank mates for gold barbs

All gold barb tank mates

Questions

Can fancy goldfish live with gold barbs?

Yes. Fancy goldfish and gold barbs make a good pair. Both are fine at 65–74°F. Plan on at least 30 gal.

What temperature suits both fancy goldfish and gold barbs?

65–74 °F. Fancy goldfish need 65–74 °F, gold barbs need 64–75 °F.

What size tank do fancy goldfish and gold barbs need together?

At least 30 gal, set by the fancy goldfish. Add space for each extra fish.