Can severums live with black skirt tetras?

Verdict
Yes

Yes. Severums and black skirt tetras get along in the same tank. Both are fine at 74–80°F. Plan on at least 55 gal.

SeverumSeverum74–84°F · pH 6–7 Black skirt tetraBlack skirt tetra70–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–80°Severum 74–84°Black skirt tetra 70–80°
The green band is the temperature range both can live in.
456789Both: 6–7Severum 6–7Black skirt tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Severum · 8 inBlack skirt tetra · 2.5 in0"1"2"3"4"5"6"7"8"
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

SeverumBlack skirt tetra
Temperature74–84 °F70–80 °F
pH6–76–7.5
Adult size8.0 in2.5 in
Minimum tank55 gal15 gal
TemperamentSemi-aggressiveSemi-aggressive
Swims atMiddleMiddle
GroupAlone or in pairsGroups of 6+
DietOmnivoreOmnivore

Better tank mates for severums

All severum tank mates

Better tank mates for black skirt tetras

All black skirt tetra tank mates

Questions

Can severums live with black skirt tetras?

Yes. Severums and black skirt tetras get along in the same tank. Both are fine at 74–80°F. Plan on at least 55 gal.

What temperature suits both severums and black skirt tetras?

74–80 °F. Severums need 74–84 °F, black skirt tetras need 70–80 °F.

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

At least 55 gal, set by the severum. Add space for each extra fish.