Can swordtails live with yellow labs?

Verdict
Yes

Yes. Swordtails and yellow labs get along in the same tank. Both are fine at 75–79°F. Plan on at least 40 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Electric yellow cichlidElectric yellow cichlid75–82°F · pH 7.8–8.6

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Swordtail 72–79°Electric yellow cichlid 75–82°
The green band is the temperature range both can live in.
456789Both: 7.8–8.3Swordtail 7–8.3Electric yellow cichlid 7.8–8.6
The green band is the pH both tolerate.

Size to scale

Swordtail · 5 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

SwordtailElectric yellow cichlid
Temperature72–79 °F75–82 °F
pH7–8.37.8–8.6
Adult size5.0 in4.0 in
Minimum tank30 gal40 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleAll levels
GroupGroups of 3+Groups of 4+
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for yellow labs

All electric yellow cichlid tank mates

Questions

Can swordtails live with yellow labs?

Yes. Swordtails and yellow labs get along in the same tank. Both are fine at 75–79°F. Plan on at least 40 gal.

What temperature suits both swordtails and yellow labs?

75–79 °F. Swordtails need 72–79 °F, yellow labs need 75–82 °F.

What size tank do swordtails and yellow labs need together?

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