Can upside down catfish live with pygmy corys?

Verdict
Yes

Yes. Upside down catfish and pygmy corys get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 Pygmy coryPygmy cory72–79°F · pH 6–7.5

Why it works

Water side by side

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

Size to scale

Upside down catfish · 4 inPygmy cory · 1 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

Upside down catfishPygmy cory
Temperature72–79 °F72–79 °F
pH6–7.56–7.5
Adult size4.0 in1.0 in
Minimum tank30 gal10 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 3+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for upside down catfish

All upside down catfish tank mates

Better tank mates for pygmy corys

All pygmy cory tank mates

Questions

Can upside down catfish live with pygmy corys?

Yes. Upside down catfish and pygmy corys get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and pygmy corys?

72–79 °F. Upside down catfish need 72–79 °F, pygmy corys need 72–79 °F.

What size tank do upside down catfish and pygmy corys need together?

At least 30 gal, set by the upside down catfish. Add space for each extra fish.