Can serpae tetras live with hatchetfish?

Verdict
Yes

Yes, serpae tetras and hatchetfish can live together. Both are fine at 75–79°F. Plan on at least 20 gal.

Serpae tetraSerpae tetra72–79°F · pH 6–7.5 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°Serpae tetra 72–79°Hatchetfish 75–81°
The green band is the temperature range both can live in.
456789Both: 6–7.5Serpae tetra 6–7.5Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Serpae tetra · 1.75 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

Serpae tetraHatchetfish
Temperature72–79 °F75–81 °F
pH6–7.55.5–7.5
Adult size1.75 in1.5 in
Minimum tank20 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleTop
GroupGroups of 6+Groups of 6+
DietOmnivoreCarnivore

Better tank mates for serpae tetras

All serpae tetra tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can serpae tetras live with hatchetfish?

Yes, serpae tetras and hatchetfish can live together. Both are fine at 75–79°F. Plan on at least 20 gal.

What temperature suits both serpae tetras and hatchetfish?

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

What size tank do serpae tetras and hatchetfish need together?

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