Can assassin snails live with hatchetfish?

Verdict
Yes

Yes, assassin snails and hatchetfish can live together. Both are fine at 75–80°F. Plan on at least 20 gal.

Assassin snailAssassin snail75–80°F · pH 7–8 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Assassin snail 75–80°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 7–7.5Assassin snail 7–8Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Assassin snail · 1 inHatchetfish · 1.5 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 snailHatchetfish
Temperature75–80 °F75–81 °F
pH7–85.5–7.5
Adult size1.0 in1.5 in
Minimum tank5 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupAlone or in pairsGroups of 6+
DietCarnivoreCarnivore

Better tank mates for assassin snails

All assassin snail tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can assassin snails live with hatchetfish?

Yes, assassin snails and hatchetfish can live together. Both are fine at 75–80°F. Plan on at least 20 gal.

What temperature suits both assassin snails and hatchetfish?

75–80 °F. Assassin snails need 75–80 °F, hatchetfish need 75–81 °F.

What size tank do assassin snails and hatchetfish need together?

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