Can assassin snails live with black neon tetras?

Verdict
Yes

Yes. Assassin snails and black neon tetras make a good pair. Both are fine at 75–80°F. Plan on at least 15 gal.

Assassin snailAssassin snail75–80°F · pH 7–8 Black neon tetraBlack neon tetra73–81°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°Black neon tetra 73–81°
The green band is the temperature range both can live in.
456789Both: 7–7.5Assassin snail 7–8Black neon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Assassin snail · 1 inBlack neon tetra · 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 snailBlack neon tetra
Temperature75–80 °F73–81 °F
pH7–85.5–7.5
Adult size1.0 in1.5 in
Minimum tank5 gal15 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 black neon tetras

All black neon tetra tank mates

Questions

Can assassin snails live with black neon tetras?

Yes. Assassin snails and black neon tetras make a good pair. Both are fine at 75–80°F. Plan on at least 15 gal.

What temperature suits both assassin snails and black neon tetras?

75–80 °F. Assassin snails need 75–80 °F, black neon tetras need 73–81 °F.

What size tank do assassin snails and black neon tetras need together?

At least 15 gal, set by the black neon tetra. Add space for each extra fish.