Can bettas live with rosy barbs?

Verdict
No

No. Bettas and rosy barbs should not share a tank. Rosy barbs nip fins, and the long fins of bettas are an easy target.

BettaBetta76–82°F · pH 6.5–7.5 Rosy barbRosy barb64–77°F · pH 6–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–77°Betta 76–82°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Betta 6.5–7.5Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Betta · 2.5 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

BettaRosy barb
Temperature76–82 °F64–77 °F
pH6.5–7.56–7.5
Adult size2.5 in4.0 in
Minimum tank5 gal30 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atTopMiddle
GroupOne per tankGroups of 6+
DietCarnivoreOmnivore

Better tank mates for bettas

All betta tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can bettas live with rosy barbs?

No. Bettas and rosy barbs should not share a tank. Rosy barbs nip fins, and the long fins of bettas are an easy target.

What temperature suits both bettas and rosy barbs?

76–77 °F. Bettas need 76–82 °F, rosy barbs need 64–77 °F.

What size tank do bettas and rosy barbs need together?

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