Can black skirt tetras live with serpae tetras?

Verdict
Yes

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

Black skirt tetraBlack skirt tetra70–80°F · pH 6–7.5 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°Black skirt tetra 70–80°Serpae tetra 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Black skirt tetra 6–7.5Serpae tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Black skirt tetra · 2.5 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

Black skirt tetraSerpae tetra
Temperature70–80 °F72–79 °F
pH6–7.56–7.5
Adult size2.5 in1.75 in
Minimum tank15 gal20 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Better tank mates for serpae tetras

All serpae tetra tank mates

Questions

Can black skirt tetras live with serpae tetras?

Yes. Black skirt 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 black skirt tetras and serpae tetras?

72–79 °F. Black skirt tetras need 70–80 °F, serpae tetras need 72–79 °F.

What size tank do black skirt tetras and serpae tetras need together?

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