Can cherry barbs live with rummy nose tetras?

Verdict
Yes

Yes. Cherry barbs and rummy nose tetras get along in the same tank. Both are fine at 75–81°F. Plan on at least 20 gal.

Cherry barbCherry barb73–81°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°Cherry barb 73–81°Rummy nose tetra 75–84°
The green band is the temperature range both can live in.
456789Both: 6–7Cherry barb 6–7.5Rummy nose tetra 5.5–7
The green band is the pH both tolerate.

Size to scale

Cherry barb · 2 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

Cherry barbRummy nose tetra
Temperature73–81 °F75–84 °F
pH6–7.55.5–7
Adult size2.0 in2.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for cherry barbs

All cherry barb tank mates

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Questions

Can cherry barbs live with rummy nose tetras?

Yes. Cherry barbs and rummy nose tetras get along in the same tank. Both are fine at 75–81°F. Plan on at least 20 gal.

What temperature suits both cherry barbs and rummy nose tetras?

75–81 °F. Cherry barbs need 73–81 °F, rummy nose tetras need 75–84 °F.

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

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