Can discus live with hatchetfish?

Verdict
No

No. Discus and hatchetfish should not share a tank. No shared temperature. Discus need 82–88°F, hatchetfish need 75–81°F.

DiscusDiscus82–88°F · pH 5.5–7 HatchetfishHatchetfish75–81°F · pH 5.5–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Discus 82–88°Hatchetfish 75–81°
The ranges do not meet, so one of them would always be too warm or too cold.
456789Both: 5.5–7Discus 5.5–7Hatchetfish 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Discus · 6 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

DiscusHatchetfish
Temperature82–88 °F75–81 °F
pH5.5–75.5–7.5
Adult size6.0 in1.5 in
Minimum tank55 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 5+Groups of 6+
DietCarnivoreCarnivore

Better tank mates for discus

All discus tank mates

Better tank mates for hatchetfish

All hatchetfish tank mates

Questions

Can discus live with hatchetfish?

No. Discus and hatchetfish should not share a tank. No shared temperature. Discus need 82–88°F, hatchetfish need 75–81°F.

What temperature suits both discus and hatchetfish?

None. Discus need 82–88 °F and hatchetfish need 75–81 °F, so the ranges do not meet.

What size tank do discus and hatchetfish need together?

At least 55 gal, set by the discus. Add space for each extra fish.