Can silver dollars live with electric blue acaras?

Verdict
Yes

Yes. Silver dollars and electric blue acaras get along in the same tank. Both are fine at 75–82°F. Plan on at least 75 gal.

Silver dollarSilver dollar75–82°F · pH 5–7 Electric blue acaraElectric blue acara72–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Silver dollar 75–82°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7Silver dollar 5–7Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Silver dollar · 6 inElectric blue acara · 6 in0"1"2"3"4"5"6"
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

Silver dollarElectric blue acara
Temperature75–82 °F72–82 °F
pH5–76.5–7.5
Adult size6.0 in6.0 in
Minimum tank75 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 5+Alone or in pairs
DietHerbivoreOmnivore

Better tank mates for silver dollars

All silver dollar tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can silver dollars live with electric blue acaras?

Yes. Silver dollars and electric blue acaras get along in the same tank. Both are fine at 75–82°F. Plan on at least 75 gal.

What temperature suits both silver dollars and electric blue acaras?

75–82 °F. Silver dollars need 75–82 °F, electric blue acaras need 72–82 °F.

What size tank do silver dollars and electric blue acaras need together?

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