Can ember tetras live with rosy barbs?

Verdict
Yes

Yes. Ember tetras and rosy barbs get along in the same tank. Both are fine at 73–77°F. Plan on at least 30 gal.

Ember tetraEmber tetra73–84°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: 73–77°Ember tetra 73–84°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 6–7Ember tetra 5.5–7Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Ember tetra · 0.8 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

Ember tetraRosy barb
Temperature73–84 °F64–77 °F
pH5.5–76–7.5
Adult size0.8 in4.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for ember tetras

All ember tetra tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can ember tetras live with rosy barbs?

Yes. Ember tetras and rosy barbs get along in the same tank. Both are fine at 73–77°F. Plan on at least 30 gal.

What temperature suits both ember tetras and rosy barbs?

73–77 °F. Ember tetras need 73–84 °F, rosy barbs need 64–77 °F.

What size tank do ember tetras and rosy barbs need together?

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