Can upside down catfish live with elephant nose fish?

Verdict
Yes

Yes. Upside down catfish and elephant nose fish get along in the same tank. Both are fine at 73–79°F. Plan on at least 55 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 Elephant nose fishElephant nose fish73–82°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Upside down catfish 72–79°Elephant nose fish 73–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Upside down catfish 6–7.5Elephant nose fish 6–7.5
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 inElephant nose fish · 9 in0"1"2"3"4"5"6"7"8"9"
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

Upside down catfishElephant nose fish
Temperature72–79 °F73–82 °F
pH6–7.56–7.5
Adult size4.0 in9.0 in
Minimum tank30 gal55 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreCarnivore

Better tank mates for upside down catfish

All upside down catfish tank mates

Better tank mates for elephant nose fish

All elephant nose fish tank mates

Questions

Can upside down catfish live with elephant nose fish?

Yes. Upside down catfish and elephant nose fish get along in the same tank. Both are fine at 73–79°F. Plan on at least 55 gal.

What temperature suits both upside down catfish and elephant nose fish?

73–79 °F. Upside down catfish need 72–79 °F, elephant nose fish need 73–82 °F.

What size tank do upside down catfish and elephant nose fish need together?

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