Can assassin snails live with dwarf neon rainbowfish?

Verdict
Yes

Yes. Assassin snails and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 20 gal.

Assassin snailAssassin snail75–80°F · pH 7–8 Dwarf neon rainbowfishDwarf neon rainbowfish75–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Assassin snail 75–80°Dwarf neon rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Assassin snail 7–8Dwarf neon rainbowfish 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Assassin snail · 1 inDwarf neon rainbowfish · 2.5 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 snailDwarf neon rainbowfish
Temperature75–80 °F75–82 °F
pH7–86.5–7.5
Adult size1.0 in2.5 in
Minimum tank5 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupAlone or in pairsGroups of 6+
DietCarnivoreOmnivore

Better tank mates for assassin snails

All assassin snail tank mates

Better tank mates for dwarf neon rainbowfish

All dwarf neon rainbowfish tank mates

Questions

Can assassin snails live with dwarf neon rainbowfish?

Yes. Assassin snails and dwarf neon rainbowfish get along in the same tank. Both are fine at 75–80°F. Plan on at least 20 gal.

What temperature suits both assassin snails and dwarf neon rainbowfish?

75–80 °F. Assassin snails need 75–80 °F, dwarf neon rainbowfish need 75–82 °F.

What size tank do assassin snails and dwarf neon rainbowfish need together?

At least 20 gal, set by the dwarf neon rainbowfish. Add space for each extra fish.