Can oscars live with severums?

Verdict
Yes

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

OscarOscar74–81°F · pH 6–8 SeverumSeverum74–84°F · pH 6–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–81°Oscar 74–81°Severum 74–84°
The green band is the temperature range both can live in.
456789Both: 6–7Oscar 6–8Severum 6–7
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inSeverum · 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

OscarSeverum
Temperature74–81 °F74–84 °F
pH6–86–7
Adult size12.0 in8.0 in
Minimum tank75 gal55 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleMiddle
GroupAlone or in pairsAlone or in pairs
DietCarnivoreOmnivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for severums

All severum tank mates

Questions

Can oscars live with severums?

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

What temperature suits both oscars and severums?

74–81 °F. Oscars need 74–81 °F, severums need 74–84 °F.

What size tank do oscars and severums need together?

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