Can oscars live with peacock cichlids?

Verdict
Yes

Yes. Oscars and peacock cichlids get along in the same tank. Both are fine at 76–81°F. Plan on at least 75 gal.

OscarOscar74–81°F · pH 6–8 Peacock cichlidPeacock cichlid76–82°F · pH 7.8–8.6

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–81°Oscar 74–81°Peacock cichlid 76–82°
The green band is the temperature range both can live in.
456789Both: 7.8–8Oscar 6–8Peacock cichlid 7.8–8.6
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inPeacock cichlid · 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

OscarPeacock cichlid
Temperature74–81 °F76–82 °F
pH6–87.8–8.6
Adult size12.0 in6.0 in
Minimum tank75 gal55 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 4+
DietCarnivoreCarnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for peacock cichlids

All peacock cichlid tank mates

Questions

Can oscars live with peacock cichlids?

Yes. Oscars and peacock cichlids get along in the same tank. Both are fine at 76–81°F. Plan on at least 75 gal.

What temperature suits both oscars and peacock cichlids?

76–81 °F. Oscars need 74–81 °F, peacock cichlids need 76–82 °F.

What size tank do oscars and peacock cichlids need together?

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