Can oscars live with bichirs?

Verdict
Yes

Yes. Oscars and bichirs make a good pair. Both are fine at 74–81°F. Plan on at least 75 gal.

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–81°Oscar 74–81°Bichir 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Oscar 6–8Bichir 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inBichir · 12 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

OscarBichir
Temperature74–81 °F72–82 °F
pH6–86.5–7.5
Adult size12.0 in12.0 in
Minimum tank75 gal75 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleBottom
GroupAlone or in pairsAlone or in pairs
DietCarnivoreCarnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for bichirs

All bichir tank mates

Questions

Can oscars live with bichirs?

Yes. Oscars and bichirs make a good pair. Both are fine at 74–81°F. Plan on at least 75 gal.

What temperature suits both oscars and bichirs?

74–81 °F. Oscars need 74–81 °F, bichirs need 72–82 °F.

What size tank do oscars and bichirs need together?

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