Can swordtails live with glowlight tetras?

Verdict
Yes

Yes. Swordtails and glowlight tetras get along in the same tank. Both are fine at 74–79°F. Plan on at least 30 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Glowlight tetraGlowlight tetra74–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–79°Swordtail 72–79°Glowlight tetra 74–80°
The green band is the temperature range both can live in.
456789Both: 7–7.5Swordtail 7–8.3Glowlight tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Swordtail · 5 inGlowlight tetra · 1.5 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

SwordtailGlowlight tetra
Temperature72–79 °F74–80 °F
pH7–8.36–7.5
Adult size5.0 in1.5 in
Minimum tank30 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for swordtails

All swordtail tank mates

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Questions

Can swordtails live with glowlight tetras?

Yes. Swordtails and glowlight tetras get along in the same tank. Both are fine at 74–79°F. Plan on at least 30 gal.

What temperature suits both swordtails and glowlight tetras?

74–79 °F. Swordtails need 72–79 °F, glowlight tetras need 74–80 °F.

What size tank do swordtails and glowlight tetras need together?

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