Can angelfish live with upside down catfish?

Verdict
Yes

Yes, angelfish and upside down catfish can live together. Both are fine at 76–79°F. Plan on at least 30 gal.

AngelfishAngelfish76–84°F · pH 6–7.5 Upside down catfishUpside down catfish72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–79°Angelfish 76–84°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Angelfish 6–7.5Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Angelfish · 6 inUpside down catfish · 4 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

AngelfishUpside down catfish
Temperature76–84 °F72–79 °F
pH6–7.56–7.5
Adult size6.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupAlone or in pairsGroups of 3+
DietOmnivoreOmnivore

Better tank mates for angelfish

All angelfish tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can angelfish live with upside down catfish?

Yes, angelfish and upside down catfish can live together. Both are fine at 76–79°F. Plan on at least 30 gal.

What temperature suits both angelfish and upside down catfish?

76–79 °F. Angelfish need 76–84 °F, upside down catfish need 72–79 °F.

What size tank do angelfish and upside down catfish need together?

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