Can neon tetras live with serpae tetras?

Verdict
Yes

Yes. Neon tetras and serpae tetras make a good pair. Both are fine at 72–79°F. Plan on at least 20 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 Serpae tetraSerpae tetra72–79°F · pH 6–7.5

Why it works

Water side by side

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

Size to scale

Neon tetra · 1.5 inSerpae tetra · 1.75 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

Neon tetraSerpae tetra
Temperature72–79 °F72–79 °F
pH6–76–7.5
Adult size1.5 in1.75 in
Minimum tank10 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for serpae tetras

All serpae tetra tank mates

Questions

Can neon tetras live with serpae tetras?

Yes. Neon tetras and serpae tetras make a good pair. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both neon tetras and serpae tetras?

72–79 °F. Neon tetras need 72–79 °F, serpae tetras need 72–79 °F.

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

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