Can otocinclus live with electric blue acaras?

Verdict
Yes

Yes. Otocinclus and electric blue acaras make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

OtocinclusOtocinclus72–79°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: 72–79°Otocinclus 72–79°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Otocinclus 6–7.5Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Otocinclus · 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

OtocinclusElectric blue acara
Temperature72–79 °F72–82 °F
pH6–7.56.5–7.5
Adult size2.0 in6.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupGroups of 6+Alone or in pairs
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can otocinclus live with electric blue acaras?

Yes. Otocinclus and electric blue acaras make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both otocinclus and electric blue acaras?

72–79 °F. Otocinclus need 72–79 °F, electric blue acaras need 72–82 °F.

What size tank do otocinclus and electric blue acaras need together?

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