Can rams live with rosy barbs?

Verdict
No

No. Rams and rosy barbs should not share a tank. No shared temperature. Rams need 80–86°F, rosy barbs need 64–77°F.

German blue ramGerman blue ram80–86°F · pH 5–7 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°German blue ram 80–86°Rosy barb 64–77°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 6–7German blue ram 5–7Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

German blue ram · 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

German blue ramRosy barb
Temperature80–86 °F64–77 °F
pH5–76–7.5
Adult size2.5 in4.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for rams

All german blue ram tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can rams live with rosy barbs?

No. Rams and rosy barbs should not share a tank. No shared temperature. Rams need 80–86°F, rosy barbs need 64–77°F.

What temperature suits both rams and rosy barbs?

None. Rams need 80–86 °F and rosy barbs need 64–77 °F, so the ranges do not meet.

What size tank do rams and rosy barbs need together?

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