Can rummy nose tetras live with rosy barbs?

Verdict
Yes

Yes. Rummy nose tetras and rosy barbs make a good pair. Both are fine at 75–77°F. Plan on at least 30 gal.

Rummy nose tetraRummy nose tetra75–84°F · pH 5.5–7 Rosy barbRosy barb64–77°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–77°Rummy nose tetra 75–84°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 6–7Rummy nose tetra 5.5–7Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Rummy nose tetra · 2 inRosy barb · 4 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

Rummy nose tetraRosy barb
Temperature75–84 °F64–77 °F
pH5.5–76–7.5
Adult size2.0 in4.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for rummy nose tetras

All rummy nose tetra tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can rummy nose tetras live with rosy barbs?

Yes. Rummy nose tetras and rosy barbs make a good pair. Both are fine at 75–77°F. Plan on at least 30 gal.

What temperature suits both rummy nose tetras and rosy barbs?

75–77 °F. Rummy nose tetras need 75–84 °F, rosy barbs need 64–77 °F.

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

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