Can harlequin rasboras live with ramshorn snails?

Verdict
Yes

Yes. Harlequin rasboras and ramshorn snails make a good pair. Both are fine at 72–80°F. Plan on at least 10 gal.

Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5 Ramshorn snailRamshorn snail70–80°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–80°Harlequin rasbora 72–80°Ramshorn snail 70–80°
The green band is the temperature range both can live in.
456789Both: 7–7.5Harlequin rasbora 6–7.5Ramshorn snail 7–8
The green band is the pH both tolerate.

Size to scale

Harlequin rasbora · 2 inRamshorn snail · 1 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

Harlequin rasboraRamshorn snail
Temperature72–80 °F70–80 °F
pH6–7.57–8
Adult size2.0 in1.0 in
Minimum tank10 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Better tank mates for ramshorn snails

All ramshorn snail tank mates

Questions

Can harlequin rasboras live with ramshorn snails?

Yes. Harlequin rasboras and ramshorn snails make a good pair. Both are fine at 72–80°F. Plan on at least 10 gal.

What temperature suits both harlequin rasboras and ramshorn snails?

72–80 °F. Harlequin rasboras need 72–80 °F, ramshorn snails need 70–80 °F.

What size tank do harlequin rasboras and ramshorn snails need together?

At least 10 gal, set by the harlequin rasbora. Add space for each extra fish.