Can guppies live with assassin snails?

Verdict
Yes

Yes. Guppies and assassin snails get along in the same tank. Both are fine at 75–80°F. Plan on at least 10 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 Assassin snailAssassin snail75–80°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Guppy 72–82°Assassin snail 75–80°
The green band is the temperature range both can live in.
456789Both: 7–7.8Guppy 6.8–7.8Assassin snail 7–8
The green band is the pH both tolerate.

Size to scale

Guppy · 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

GuppyAssassin snail
Temperature72–82 °F75–80 °F
pH6.8–7.87–8
Adult size2.0 in1.0 in
Minimum tank10 gal5 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can guppies live with assassin snails?

Yes. Guppies and assassin snails get along in the same tank. Both are fine at 75–80°F. Plan on at least 10 gal.

What temperature suits both guppies and assassin snails?

75–80 °F. Guppies need 72–82 °F, assassin snails need 75–80 °F.

What size tank do guppies and assassin snails need together?

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