Can upside down catfish live with rosy barbs?

Verdict
Yes

Yes, upside down catfish and rosy barbs can live together. Both are fine at 72–77°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 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: 72–77°Upside down catfish 72–79°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 6–7.5Upside down catfish 6–7.5Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 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

Upside down catfishRosy barb
Temperature72–79 °F64–77 °F
pH6–7.56–7.5
Adult size4.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for upside down catfish

All upside down catfish tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can upside down catfish live with rosy barbs?

Yes, upside down catfish and rosy barbs can live together. Both are fine at 72–77°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and rosy barbs?

72–77 °F. Upside down catfish need 72–79 °F, rosy barbs need 64–77 °F.

What size tank do upside down catfish and rosy barbs need together?

At least 30 gal, set by the upside down catfish. Add space for each extra fish.