Can rosy barbs live with glowlight tetras?

Verdict
Yes

Yes. Rosy barbs and glowlight tetras make a good pair. Both are fine at 74–77°F. Plan on at least 30 gal.

Rosy barbRosy barb64–77°F · pH 6–7.5 Glowlight tetraGlowlight tetra74–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–77°Rosy barb 64–77°Glowlight tetra 74–80°
The green band is the temperature range both can live in.
456789Both: 6–7.5Rosy barb 6–7.5Glowlight tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Rosy barb · 4 inGlowlight tetra · 1.5 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

Rosy barbGlowlight tetra
Temperature64–77 °F74–80 °F
pH6–7.56–7.5
Adult size4.0 in1.5 in
Minimum tank30 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for rosy barbs

All rosy barb tank mates

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Questions

Can rosy barbs live with glowlight tetras?

Yes. Rosy barbs and glowlight tetras make a good pair. Both are fine at 74–77°F. Plan on at least 30 gal.

What temperature suits both rosy barbs and glowlight tetras?

74–77 °F. Rosy barbs need 64–77 °F, glowlight tetras need 74–80 °F.

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

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