Can discus live with yellow labs?

Verdict
No

No. Discus and yellow labs should not share a tank. Different water: discus want pH 5.5–7, yellow labs want pH 7.8–8.6.

DiscusDiscus82–88°F · pH 5.5–7 Electric yellow cichlidElectric yellow cichlid75–82°F · pH 7.8–8.6

What to watch

Water side by side

55°60°65°70°75°80°85°90°Both: 82°Discus 82–88°Electric yellow cichlid 75–82°
The green band is the temperature range both can live in.
456789Discus 5.5–7Electric yellow cichlid 7.8–8.6
No pH suits both. One would live in the wrong water all the time.

Size to scale

Discus · 6 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

DiscusElectric yellow cichlid
Temperature82–88 °F75–82 °F
pH5.5–77.8–8.6
Adult size6.0 in4.0 in
Minimum tank55 gal40 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleAll levels
GroupGroups of 5+Groups of 4+
DietCarnivoreOmnivore

Better tank mates for discus

All discus tank mates

Better tank mates for yellow labs

All electric yellow cichlid tank mates

Questions

Can discus live with yellow labs?

No. Discus and yellow labs should not share a tank. Different water: discus want pH 5.5–7, yellow labs want pH 7.8–8.6.

What temperature suits both discus and yellow labs?

82–82 °F. Discus need 82–88 °F, yellow labs need 75–82 °F.

What size tank do discus and yellow labs need together?

At least 55 gal, set by the discus. Add space for each extra fish.