Can otocinclus live with ramshorn snails?

Verdict
Yes

Yes. Otocinclus and ramshorn snails make a good pair. Both are fine at 72–79°F. Plan on at least 20 gal.

OtocinclusOtocinclus72–79°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: 72–79°Otocinclus 72–79°Ramshorn snail 70–80°
The green band is the temperature range both can live in.
456789Both: 7–7.5Otocinclus 6–7.5Ramshorn snail 7–8
The green band is the pH both tolerate.

Size to scale

Otocinclus · 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

OtocinclusRamshorn snail
Temperature72–79 °F70–80 °F
pH6–7.57–8
Adult size2.0 in1.0 in
Minimum tank20 gal5 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupGroups of 6+Alone or in pairs
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for ramshorn snails

All ramshorn snail tank mates

Questions

Can otocinclus live with ramshorn snails?

Yes. Otocinclus and ramshorn snails make a good pair. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both otocinclus and ramshorn snails?

72–79 °F. Otocinclus need 72–79 °F, ramshorn snails need 70–80 °F.

What size tank do otocinclus and ramshorn snails need together?

At least 20 gal, set by the otocinclus. Add space for each extra fish.