Can oscars live with dojo loaches?

Verdict
Yes

Yes, oscars and dojo loaches can live together. Both are fine at 74–77°F. Plan on at least 75 gal.

OscarOscar74–81°F · pH 6–8 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: 74–77°Oscar 74–81°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.5–8Oscar 6–8Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inDojo loach · 6 in0"2"4"6"8"10"12"
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

OscarDojo loach
Temperature74–81 °F59–77 °F
pH6–86.5–8
Adult size12.0 in6.0 in
Minimum tank75 gal55 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupAlone or in pairsGroups of 3+
DietCarnivoreOmnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can oscars live with dojo loaches?

Yes, oscars and dojo loaches can live together. Both are fine at 74–77°F. Plan on at least 75 gal.

What temperature suits both oscars and dojo loaches?

74–77 °F. Oscars need 74–81 °F, dojo loaches need 59–77 °F.

What size tank do oscars and dojo loaches need together?

At least 75 gal, set by the oscar. Add space for each extra fish.