Can killifish live with dojo loaches?

Verdict
Yes

Yes. Killifish and dojo loaches make a good pair. Both are fine at 70–77°F. Plan on at least 55 gal.

KillifishKillifish70–77°F · pH 5.5–7 Dojo loachDojo loach59–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 70–77°Killifish 70–77°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7Killifish 5.5–7Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Killifish · 2.5 inDojo loach · 6 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

KillifishDojo loach
Temperature70–77 °F59–77 °F
pH5.5–76.5–8
Adult size2.5 in6.0 in
Minimum tank10 gal55 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupAlone or in pairsGroups of 3+
DietCarnivoreOmnivore

Better tank mates for killifish

All killifish tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can killifish live with dojo loaches?

Yes. Killifish and dojo loaches make a good pair. Both are fine at 70–77°F. Plan on at least 55 gal.

What temperature suits both killifish and dojo loaches?

70–77 °F. Killifish need 70–77 °F, dojo loaches need 59–77 °F.

What size tank do killifish and dojo loaches need together?

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