Can gold barbs live with electric blue acaras?

Verdict
Yes

Yes. Gold barbs and electric blue acaras get along in the same tank. Both are fine at 72–75°F. Plan on at least 30 gal.

Gold barbGold barb64–75°F · pH 6–8 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: 72–75°Gold barb 64–75°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Gold barb 6–8Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Gold barb · 3 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

Gold barbElectric blue acara
Temperature64–75 °F72–82 °F
pH6–86.5–7.5
Adult size3.0 in6.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for gold barbs

All gold barb tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can gold barbs live with electric blue acaras?

Yes. Gold barbs and electric blue acaras get along in the same tank. Both are fine at 72–75°F. Plan on at least 30 gal.

What temperature suits both gold barbs and electric blue acaras?

72–75 °F. Gold barbs need 64–75 °F, electric blue acaras need 72–82 °F.

What size tank do gold barbs and electric blue acaras need together?

At least 30 gal, set by the electric blue acara. Add space for each extra fish.