Can oscars live with silver dollars?

Verdict
Yes

Yes, oscars and silver dollars can live together. Both are fine at 75–81°F. Plan on at least 75 gal.

OscarOscar74–81°F · pH 6–8 Silver dollarSilver dollar75–82°F · pH 5–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–81°Oscar 74–81°Silver dollar 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7Oscar 6–8Silver dollar 5–7
The green band is the pH both tolerate.

Size to scale

Oscar · 12 inSilver dollar · 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

OscarSilver dollar
Temperature74–81 °F75–82 °F
pH6–85–7
Adult size12.0 in6.0 in
Minimum tank75 gal75 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 5+
DietCarnivoreHerbivore

Better tank mates for oscars

All oscar tank mates

Better tank mates for silver dollars

All silver dollar tank mates

Questions

Can oscars live with silver dollars?

Yes, oscars and silver dollars can live together. Both are fine at 75–81°F. Plan on at least 75 gal.

What temperature suits both oscars and silver dollars?

75–81 °F. Oscars need 74–81 °F, silver dollars need 75–82 °F.

What size tank do oscars and silver dollars need together?

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