Can blue gouramis live with upside down catfish?

Verdict
Yes

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

Blue gouramiBlue gourami72–82°F · pH 6–8 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°Blue gourami 72–82°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Blue gourami 6–8Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Blue gourami · 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

Blue gouramiUpside down catfish
Temperature72–82 °F72–79 °F
pH6–86–7.5
Adult size5.0 in4.0 in
Minimum tank30 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atTopBottom
GroupAlone or in pairsGroups of 3+
DietOmnivoreOmnivore

Better tank mates for blue gouramis

All blue gourami tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can blue gouramis live with upside down catfish?

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

What temperature suits both blue gouramis and upside down catfish?

72–79 °F. Blue gouramis need 72–82 °F, upside down catfish need 72–79 °F.

What size tank do blue gouramis and upside down catfish need together?

At least 30 gal, set by the blue gourami. Add space for each extra fish.