Can severums live with upside down catfish?

Verdict
Yes

Yes, severums and upside down catfish can live together. Both are fine at 74–79°F. Plan on at least 55 gal.

SeverumSeverum74–84°F · pH 6–7 Upside down catfishUpside down catfish72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–79°Severum 74–84°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7Severum 6–7Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Severum · 8 inUpside down catfish · 4 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

SeverumUpside down catfish
Temperature74–84 °F72–79 °F
pH6–76–7.5
Adult size8.0 in4.0 in
Minimum tank55 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupAlone or in pairsGroups of 3+
DietOmnivoreOmnivore

Better tank mates for severums

All severum tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can severums live with upside down catfish?

Yes, severums and upside down catfish can live together. Both are fine at 74–79°F. Plan on at least 55 gal.

What temperature suits both severums and upside down catfish?

74–79 °F. Severums need 74–84 °F, upside down catfish need 72–79 °F.

What size tank do severums and upside down catfish need together?

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