Can neon tetras live with hatchetfish?

Verdict
Yes

Yes. Neon tetras and hatchetfish make a good pair. Both are fine at 75–79°F. Plan on at least 20 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Neon tetra 72–79°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 6–7Neon tetra 6–7Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Neon tetra · 1.5 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

Neon tetraHatchetfish
Temperature72–79 °F75–81 °F
pH6–75.5–7.5
Adult size1.5 in1.5 in
Minimum tank10 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Groups of 6+
DietOmnivoreCarnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can neon tetras live with hatchetfish?

Yes. Neon tetras and hatchetfish make a good pair. Both are fine at 75–79°F. Plan on at least 20 gal.

What temperature suits both neon tetras and hatchetfish?

75–79 °F. Neon tetras need 72–79 °F, hatchetfish need 75–81 °F.

What size tank do neon tetras and hatchetfish need together?

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