Can cardinal tetras live with yellow labs?

Verdict
No

No. Cardinal tetras and yellow labs should not share a tank. Different water: cardinal tetras want pH 4.6–7, yellow labs want pH 7.8–8.6.

Cardinal tetraCardinal tetra76–84°F · pH 4.6–7 Electric yellow cichlidElectric yellow cichlid75–82°F · pH 7.8–8.6

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–82°Cardinal tetra 76–84°Electric yellow cichlid 75–82°
The green band is the temperature range both can live in.
456789Cardinal tetra 4.6–7Electric yellow cichlid 7.8–8.6
No pH suits both. One would live in the wrong water all the time.

Size to scale

Cardinal tetra · 2 inElectric yellow cichlid · 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

Cardinal tetraElectric yellow cichlid
Temperature76–84 °F75–82 °F
pH4.6–77.8–8.6
Adult size2.0 in4.0 in
Minimum tank20 gal40 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleAll levels
GroupGroups of 6+Groups of 4+
DietOmnivoreOmnivore

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Better tank mates for yellow labs

All electric yellow cichlid tank mates

Questions

Can cardinal tetras live with yellow labs?

No. Cardinal tetras and yellow labs should not share a tank. Different water: cardinal tetras want pH 4.6–7, yellow labs want pH 7.8–8.6.

What temperature suits both cardinal tetras and yellow labs?

76–82 °F. Cardinal tetras need 76–84 °F, yellow labs need 75–82 °F.

What size tank do cardinal tetras and yellow labs need together?

At least 40 gal, set by the electric yellow cichlid. Add space for each extra fish.