Can hatchetfish live with lemon tetras?

Verdict
Yes

Yes. Hatchetfish and lemon tetras make a good pair. Both are fine at 75–81°F. Plan on at least 20 gal.

HatchetfishHatchetfish75–81°F · pH 5.5–7.5 Lemon tetraLemon tetra72–82°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Hatchetfish 75–81°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 5.5–7.5Hatchetfish 5.5–7.5Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Hatchetfish · 1.5 inLemon tetra · 2 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

HatchetfishLemon tetra
Temperature75–81 °F72–82 °F
pH5.5–7.55.5–7.5
Adult size1.5 in2.0 in
Minimum tank20 gal15 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 6+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for hatchetfish

All hatchetfish tank mates

Better tank mates for lemon tetras

All lemon tetra tank mates

Questions

Can hatchetfish live with lemon tetras?

Yes. Hatchetfish and lemon tetras make a good pair. Both are fine at 75–81°F. Plan on at least 20 gal.

What temperature suits both hatchetfish and lemon tetras?

75–81 °F. Hatchetfish need 75–81 °F, lemon tetras need 72–82 °F.

What size tank do hatchetfish and lemon tetras need together?

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