Can chili rasboras live with upside down catfish?

Verdict
Yes

Yes. Chili rasboras and upside down catfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 30 gal.

Chili rasboraChili rasbora75–82°F · pH 4–7 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: 75–79°Chili rasbora 75–82°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7Chili rasbora 4–7Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Chili rasbora · 0.8 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

Chili rasboraUpside down catfish
Temperature75–82 °F72–79 °F
pH4–76–7.5
Adult size0.8 in4.0 in
Minimum tank5 gal30 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 8+Groups of 3+
DietCarnivoreOmnivore

Better tank mates for chili rasboras

All chili rasbora tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can chili rasboras live with upside down catfish?

Yes. Chili rasboras and upside down catfish get along in the same tank. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both chili rasboras and upside down catfish?

75–79 °F. Chili rasboras need 75–82 °F, upside down catfish need 72–79 °F.

What size tank do chili rasboras and upside down catfish need together?

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