Can congo tetras live with electric blue acaras?

Verdict
Yes

Yes, congo tetras and electric blue acaras can live together. Both are fine at 73–82°F. Plan on at least 30 gal.

Congo tetraCongo tetra73–82°F · pH 6–7.5 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: 73–82°Congo tetra 73–82°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Congo tetra 6–7.5Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Congo tetra · 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

Congo tetraElectric blue acara
Temperature73–82 °F72–82 °F
pH6–7.56.5–7.5
Adult size3.0 in6.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can congo tetras live with electric blue acaras?

Yes, congo tetras and electric blue acaras can live together. Both are fine at 73–82°F. Plan on at least 30 gal.

What temperature suits both congo tetras and electric blue acaras?

73–82 °F. Congo tetras need 73–82 °F, electric blue acaras need 72–82 °F.

What size tank do congo tetras and electric blue acaras need together?

At least 30 gal, set by the congo tetra. Add space for each extra fish.