Can rosy barbs live with dwarf neon rainbowfish?

Verdict
Yes

Yes, rosy barbs and dwarf neon rainbowfish can live together. Both are fine at 75–77°F. Plan on at least 30 gal.

Rosy barbRosy barb64–77°F · pH 6–7.5 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–77°Rosy barb 64–77°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Rosy barb 6–7.5Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Rosy barb · 4 inDwarf neon rainbowfish · 2.5 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 barbDwarf neon rainbowfish
Temperature64–77 °F75–82 °F
pH6–7.56.5–7.5
Adult size4.0 in2.5 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 dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can rosy barbs live with dwarf neon rainbowfish?

Yes, rosy barbs and dwarf neon rainbowfish can live together. Both are fine at 75–77°F. Plan on at least 30 gal.

What temperature suits both rosy barbs and dwarf neon rainbowfish?

75–77 °F. Rosy barbs need 64–77 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do rosy barbs and dwarf neon rainbowfish need together?

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