Can otocinclus live with assassin snails?

Verdict
Yes

Yes, otocinclus and assassin snails can live together. Both are fine at 75–79°F. Plan on at least 20 gal.

OtocinclusOtocinclus72–79°F · pH 6–7.5 Assassin snailAssassin snail75–80°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Otocinclus 72–79°Assassin snail 75–80°
The green band is the temperature range both can live in.
456789Both: 7–7.5Otocinclus 6–7.5Assassin snail 7–8
The green band is the pH both tolerate.

Size to scale

Otocinclus · 2 inAssassin 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

OtocinclusAssassin snail
Temperature72–79 °F75–80 °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
DietHerbivoreCarnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can otocinclus live with assassin snails?

Yes, otocinclus and assassin snails can live together. Both are fine at 75–79°F. Plan on at least 20 gal.

What temperature suits both otocinclus and assassin snails?

75–79 °F. Otocinclus need 72–79 °F, assassin snails need 75–80 °F.

What size tank do otocinclus and assassin snails need together?

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