Can angelfish live with cardinal tetras?

Verdict
Yes

Yes, angelfish and cardinal tetras can live together. Both are fine at 76–84°F. Plan on at least 30 gal.

AngelfishAngelfish76–84°F · pH 6–7.5 Cardinal tetraCardinal tetra76–84°F · pH 4.6–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–84°Angelfish 76–84°Cardinal tetra 76–84°
The green band is the temperature range both can live in.
456789Both: 6–7Angelfish 6–7.5Cardinal tetra 4.6–7
The green band is the pH both tolerate.

Size to scale

Angelfish · 6 inCardinal tetra · 2 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

AngelfishCardinal tetra
Temperature76–84 °F76–84 °F
pH6–7.54.6–7
Adult size6.0 in2.0 in
Minimum tank30 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for angelfish

All angelfish tank mates

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Questions

Can angelfish live with cardinal tetras?

Yes, angelfish and cardinal tetras can live together. Both are fine at 76–84°F. Plan on at least 30 gal.

What temperature suits both angelfish and cardinal tetras?

76–84 °F. Angelfish need 76–84 °F, cardinal tetras need 76–84 °F.

What size tank do angelfish and cardinal tetras need together?

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