Can lemon tetras live with electric blue acaras?

Verdict
Yes

Yes. Lemon tetras and electric blue acaras make a good pair. Both are fine at 72–82°F. Plan on at least 30 gal.

Lemon tetraLemon tetra72–82°F · pH 5.5–7.5 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: 72–82°Lemon tetra 72–82°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Lemon tetra 5.5–7.5Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Lemon tetra · 2 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

Lemon tetraElectric blue acara
Temperature72–82 °F72–82 °F
pH5.5–7.56.5–7.5
Adult size2.0 in6.0 in
Minimum tank15 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for lemon tetras

All lemon tetra tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can lemon tetras live with electric blue acaras?

Yes. Lemon tetras and electric blue acaras make a good pair. Both are fine at 72–82°F. Plan on at least 30 gal.

What temperature suits both lemon tetras and electric blue acaras?

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

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

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