Can rosy barbs live with clown plecos?

Verdict
Yes

Yes. Rosy barbs and clown plecos make a good pair. Both are fine at 73–77°F. Plan on at least 30 gal.

Rosy barbRosy barb64–77°F · pH 6–7.5 Clown plecoClown pleco73–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–77°Rosy barb 64–77°Clown pleco 73–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Rosy barb 6–7.5Clown pleco 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Rosy barb · 4 inClown pleco · 3.5 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 barbClown pleco
Temperature64–77 °F73–82 °F
pH6–7.56.5–7.5
Adult size4.0 in3.5 in
Minimum tank30 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreHerbivore

Better tank mates for rosy barbs

All rosy barb tank mates

Better tank mates for clown plecos

All clown pleco tank mates

Questions

Can rosy barbs live with clown plecos?

Yes. Rosy barbs and clown plecos make a good pair. Both are fine at 73–77°F. Plan on at least 30 gal.

What temperature suits both rosy barbs and clown plecos?

73–77 °F. Rosy barbs need 64–77 °F, clown plecos need 73–82 °F.

What size tank do rosy barbs and clown plecos need together?

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