Can hatchetfish live with endlers?

Verdict
Yes

Yes, hatchetfish and endlers can live together. Both are fine at 75–81°F. Plan on at least 20 gal.

HatchetfishHatchetfish75–81°F · pH 5.5–7.5 Endler's livebearerEndler's livebearer72–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Hatchetfish 75–81°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Hatchetfish 5.5–7.5Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Hatchetfish · 1.5 inEndler's livebearer · 1 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

HatchetfishEndler's livebearer
Temperature75–81 °F72–82 °F
pH5.5–7.57–8
Adult size1.5 in1.0 in
Minimum tank20 gal5 gal
TemperamentPeacefulPeaceful
Swims atTopTop
GroupGroups of 6+Groups of 3+
DietCarnivoreOmnivore

Better tank mates for hatchetfish

All hatchetfish tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can hatchetfish live with endlers?

Yes, hatchetfish and endlers can live together. Both are fine at 75–81°F. Plan on at least 20 gal.

What temperature suits both hatchetfish and endlers?

75–81 °F. Hatchetfish need 75–81 °F, endlers need 72–82 °F.

What size tank do hatchetfish and endlers need together?

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