Can platies live with assassin snails?

Verdict
Yes

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

PlatyPlaty70–80°F · pH 7–8.2 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°Platy 70–80°Assassin snail 75–80°
The green band is the temperature range both can live in.
456789Both: 7–8Platy 7–8.2Assassin snail 7–8
The green band is the pH both tolerate.

Size to scale

Platy · 2.5 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

PlatyAssassin snail
Temperature70–80 °F75–80 °F
pH7–8.27–8
Adult size2.5 in1.0 in
Minimum tank10 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for platies

All platy tank mates

Better tank mates for assassin snails

All assassin snail tank mates

Questions

Can platies live with assassin snails?

Yes. Platies 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 platies and assassin snails?

75–80 °F. Platies need 70–80 °F, assassin snails need 75–80 °F.

What size tank do platies and assassin snails need together?

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