Can tiger barbs live with rummy nose tetras?

Verdict
Yes

Yes. Tiger barbs and rummy nose tetras 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 Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Tiger barb 72–81°Rummy nose tetra 75–84°
The green band is the temperature range both can live in.
456789Both: 6–7Tiger barb 6–7.5Rummy nose tetra 5.5–7
The green band is the pH both tolerate.

Size to scale

Tiger barb · 3 inRummy nose tetra · 2 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 barbRummy nose tetra
Temperature72–81 °F75–84 °F
pH6–7.55.5–7
Adult size3.0 in2.0 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 rummy nose tetras

All rummy nose tetra tank mates

Questions

Can tiger barbs live with rummy nose tetras?

Yes. Tiger barbs and rummy nose tetras 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 rummy nose tetras?

75–81 °F. Tiger barbs need 72–81 °F, rummy nose tetras need 75–84 °F.

What size tank do tiger barbs and rummy nose tetras need together?

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