Can oscars live with clown loaches?

Verdict
Yes

Yes. Oscars and clown loaches get along in the same tank. Both are fine at 77–81°F. Plan on at least 75 gal.

OscarOscar74–81°F · pH 6–8 Clown loachClown loach77–86°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 77–81°Oscar 74–81°Clown loach 77–86°
The green band is the temperature range both can live in.
456789Both: 6–7.5Oscar 6–8Clown loach 6–7.5
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inClown loach · 8 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

OscarClown loach
Temperature74–81 °F77–86 °F
pH6–86–7.5
Adult size12.0 in8.0 in
Minimum tank75 gal75 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupAlone or in pairsGroups of 5+
DietCarnivoreOmnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for clown loaches

All clown loach tank mates

Questions

Can oscars live with clown loaches?

Yes. Oscars and clown loaches get along in the same tank. Both are fine at 77–81°F. Plan on at least 75 gal.

What temperature suits both oscars and clown loaches?

77–81 °F. Oscars need 74–81 °F, clown loaches need 77–86 °F.

What size tank do oscars and clown loaches need together?

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