Can tiger barbs live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Tiger barbs and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–81°F. Plan on at least 30 gal.

Tiger barbTiger barb72–81°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: 75–81°Tiger barb 72–81°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Tiger barb 6–7.5Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Tiger barb · 3 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

Tiger barbDwarf neon rainbowfish
Temperature72–81 °F75–82 °F
pH6–7.56.5–7.5
Adult size3.0 in2.5 in
Minimum tank30 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for tiger barbs

All tiger barb tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can tiger barbs live with dwarf neon rainbowfish?

Yes. Tiger barbs and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–81°F. Plan on at least 30 gal.

What temperature suits both tiger barbs and dwarf neon rainbowfish?

75–81 °F. Tiger barbs need 72–81 °F, dwarf neon rainbowfish need 75–82 °F.

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

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