Can pictus catfish live with upside down catfish?

Verdict
Yes

Yes. Pictus catfish and upside down catfish make a good pair. Both are fine at 72–79°F. Plan on at least 55 gal.

Pictus catfishPictus catfish72–79°F · pH 6–7.5 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: 72–79°Pictus catfish 72–79°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Pictus catfish 6–7.5Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Pictus catfish · 5 inUpside down catfish · 4 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

Pictus catfishUpside down catfish
Temperature72–79 °F72–79 °F
pH6–7.56–7.5
Adult size5.0 in4.0 in
Minimum tank55 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomBottom
GroupGroups of 3+Groups of 3+
DietCarnivoreOmnivore

Better tank mates for pictus catfish

All pictus catfish tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can pictus catfish live with upside down catfish?

Yes. Pictus catfish and upside down catfish make a good pair. Both are fine at 72–79°F. Plan on at least 55 gal.

What temperature suits both pictus catfish and upside down catfish?

72–79 °F. Pictus catfish need 72–79 °F, upside down catfish need 72–79 °F.

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

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