Can swordtails live with lemon tetras?

Verdict
Yes

Yes. Swordtails and lemon tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

SwordtailSwordtail72–79°F · pH 7–8.3 Lemon tetraLemon tetra72–82°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Swordtail 72–79°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Swordtail 7–8.3Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Swordtail · 5 inLemon 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

SwordtailLemon tetra
Temperature72–79 °F72–82 °F
pH7–8.35.5–7.5
Adult size5.0 in2.0 in
Minimum tank30 gal15 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 lemon tetras

All lemon tetra tank mates

Questions

Can swordtails live with lemon tetras?

Yes. Swordtails and lemon tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both swordtails and lemon tetras?

72–79 °F. Swordtails need 72–79 °F, lemon tetras need 72–82 °F.

What size tank do swordtails and lemon tetras need together?

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