Can assassin snails live with rosy barbs?

Verdict
Yes

Yes. Assassin snails and rosy barbs get along in the same tank. Both are fine at 75–77°F. Plan on at least 30 gal.

Assassin snailAssassin snail75–80°F · pH 7–8 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: 75–77°Assassin snail 75–80°Rosy barb 64–77°
The green band is the temperature range both can live in.
456789Both: 7–7.5Assassin snail 7–8Rosy barb 6–7.5
The green band is the pH both tolerate.

Size to scale

Assassin snail · 1 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

Assassin snailRosy barb
Temperature75–80 °F64–77 °F
pH7–86–7.5
Adult size1.0 in4.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for assassin snails

All assassin snail tank mates

Better tank mates for rosy barbs

All rosy barb tank mates

Questions

Can assassin snails live with rosy barbs?

Yes. Assassin snails and rosy barbs get along in the same tank. Both are fine at 75–77°F. Plan on at least 30 gal.

What temperature suits both assassin snails and rosy barbs?

75–77 °F. Assassin snails need 75–80 °F, rosy barbs need 64–77 °F.

What size tank do assassin snails and rosy barbs need together?

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