Can black skirt tetras live with electric blue acaras?

Verdict
Yes

Yes. Black skirt tetras and electric blue acaras get along in the same tank. Both are fine at 72–80°F. Plan on at least 30 gal.

Black skirt tetraBlack skirt tetra70–80°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: 72–80°Black skirt tetra 70–80°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Black skirt tetra 6–7.5Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Black skirt tetra · 2.5 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

Black skirt tetraElectric blue acara
Temperature70–80 °F72–82 °F
pH6–7.56.5–7.5
Adult size2.5 in6.0 in
Minimum tank15 gal30 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can black skirt tetras live with electric blue acaras?

Yes. Black skirt tetras and electric blue acaras get along in the same tank. Both are fine at 72–80°F. Plan on at least 30 gal.

What temperature suits both black skirt tetras and electric blue acaras?

72–80 °F. Black skirt tetras need 70–80 °F, electric blue acaras need 72–82 °F.

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

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