Can guppies live with black skirt tetras?

Verdict
No

No. Guppies and black skirt tetras should not share a tank. Black skirt tetras nip fins, and the long fins of guppies are an easy target.

GuppyGuppy72–82°F · pH 6.8–7.8 Black skirt tetraBlack skirt tetra70–80°F · pH 6–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–80°Guppy 72–82°Black skirt tetra 70–80°
The green band is the temperature range both can live in.
456789Both: 6.8–7.5Guppy 6.8–7.8Black skirt tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inBlack skirt tetra · 2.5 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

GuppyBlack skirt tetra
Temperature72–82 °F70–80 °F
pH6.8–7.86–7.5
Adult size2.0 in2.5 in
Minimum tank10 gal15 gal
TemperamentPeacefulSemi-aggressive
Swims atTopMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Questions

Can guppies live with black skirt tetras?

No. Guppies and black skirt tetras should not share a tank. Black skirt tetras nip fins, and the long fins of guppies are an easy target.

What temperature suits both guppies and black skirt tetras?

72–80 °F. Guppies need 72–82 °F, black skirt tetras need 70–80 °F.

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

At least 15 gal, set by the black skirt tetra. Add space for each extra fish.