Can sparkling gouramis live with upside down catfish?

Verdict
Yes

Yes. Sparkling gouramis and upside down catfish make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

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

Size to scale

Sparkling gourami · 1.5 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

Sparkling gouramiUpside down catfish
Temperature72–82 °F72–79 °F
pH6–7.56–7.5
Adult size1.5 in4.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupGroups of 4+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for sparkling gouramis

All sparkling gourami tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can sparkling gouramis live with upside down catfish?

Yes. Sparkling gouramis and upside down catfish make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both sparkling gouramis and upside down catfish?

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

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

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