Can mollies live with gold barbs?

Verdict
Yes

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

MollyMolly72–82°F · pH 7.5–8.5 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°Molly 72–82°Gold barb 64–75°
The green band is the temperature range both can live in.
456789Both: 7.5–8Molly 7.5–8.5Gold barb 6–8
The green band is the pH both tolerate.

Size to scale

Molly · 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

MollyGold barb
Temperature72–82 °F64–75 °F
pH7.5–8.56–8
Adult size4.0 in3.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for mollies

All molly tank mates

Better tank mates for gold barbs

All gold barb tank mates

Questions

Can mollies live with gold barbs?

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

What temperature suits both mollies and gold barbs?

72–75 °F. Mollies need 72–82 °F, gold barbs need 64–75 °F.

What size tank do mollies and gold barbs need together?

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