Can assassin snails live with swordtails?

Verdict
Yes

Yes. Assassin snails and swordtails make a good pair. Both are fine at 75–79°F. Plan on at least 30 gal.

Assassin snailAssassin snail75–80°F · pH 7–8 SwordtailSwordtail72–79°F · pH 7–8.3

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Assassin snail 75–80°Swordtail 72–79°
The green band is the temperature range both can live in.
456789Both: 7–8Assassin snail 7–8Swordtail 7–8.3
The green band is the pH both tolerate.

Size to scale

Assassin snail · 1 inSwordtail · 5 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

Assassin snailSwordtail
Temperature75–80 °F72–79 °F
pH7–87–8.3
Adult size1.0 in5.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupAlone or in pairsGroups of 3+
DietCarnivoreOmnivore

Better tank mates for assassin snails

All assassin snail tank mates

Better tank mates for swordtails

All swordtail tank mates

Questions

Can assassin snails live with swordtails?

Yes. Assassin snails and swordtails make a good pair. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both assassin snails and swordtails?

75–79 °F. Assassin snails need 75–80 °F, swordtails need 72–79 °F.

What size tank do assassin snails and swordtails need together?

At least 30 gal, set by the swordtail. Add space for each extra fish.