Can serpae tetras live with lemon tetras?

Verdict
Yes

Yes. Serpae tetras and lemon tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 20 gal.

Serpae tetraSerpae tetra72–79°F · pH 6–7.5 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°Serpae tetra 72–79°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Serpae tetra 6–7.5Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Serpae tetra · 1.75 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

Serpae tetraLemon tetra
Temperature72–79 °F72–82 °F
pH6–7.55.5–7.5
Adult size1.75 in2.0 in
Minimum tank20 gal15 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for serpae tetras

All serpae tetra tank mates

Better tank mates for lemon tetras

All lemon tetra tank mates

Questions

Can serpae tetras live with lemon tetras?

Yes. Serpae tetras and lemon tetras get along in the same tank. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both serpae tetras and lemon tetras?

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

What size tank do serpae tetras and lemon tetras need together?

At least 20 gal, set by the serpae tetra. Add space for each extra fish.