Can rosy barbs live with dojo loaches?

Verdict
Yes

Yes. Rosy barbs and dojo loaches make a good pair. Both are fine at 64–77°F. Plan on at least 55 gal.

Rosy barbRosy barb64–77°F · pH 6–7.5 Dojo loachDojo loach59–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 64–77°Rosy barb 64–77°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Rosy barb 6–7.5Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Rosy barb · 4 inDojo loach · 6 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 barbDojo loach
Temperature64–77 °F59–77 °F
pH6–7.56.5–8
Adult size4.0 in6.0 in
Minimum tank30 gal55 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for rosy barbs

All rosy barb tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can rosy barbs live with dojo loaches?

Yes. Rosy barbs and dojo loaches make a good pair. Both are fine at 64–77°F. Plan on at least 55 gal.

What temperature suits both rosy barbs and dojo loaches?

64–77 °F. Rosy barbs need 64–77 °F, dojo loaches need 59–77 °F.

What size tank do rosy barbs and dojo loaches need together?

At least 55 gal, set by the dojo loach. Add space for each extra fish.