Can upside down catfish live with electric blue acaras?

Verdict
Yes

Yes, upside down catfish and electric blue acaras can live together. Both are fine at 72–79°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°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°Upside down catfish 72–79°Electric blue acara 72–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Upside down catfish 6–7.5Electric blue acara 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 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

Upside down catfishElectric blue acara
Temperature72–79 °F72–82 °F
pH6–7.56.5–7.5
Adult size4.0 in6.0 in
Minimum tank30 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomMiddle
GroupGroups of 3+Alone or in pairs
DietOmnivoreOmnivore

Better tank mates for upside down catfish

All upside down catfish tank mates

Better tank mates for electric blue acaras

All electric blue acara tank mates

Questions

Can upside down catfish live with electric blue acaras?

Yes, upside down catfish and electric blue acaras can live together. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and electric blue acaras?

72–79 °F. Upside down catfish need 72–79 °F, electric blue acaras need 72–82 °F.

What size tank do upside down catfish and electric blue acaras need together?

At least 30 gal, set by the upside down catfish. Add space for each extra fish.