Can upside down catfish live with boesemani rainbowfish?

Verdict
Yes

Yes, upside down catfish and boesemani rainbowfish can live together. Both are fine at 75–79°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Upside down catfish 72–79°Boesemani rainbowfish 75–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Upside down catfish 6–7.5Boesemani rainbowfish 7–8
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 inBoesemani rainbowfish · 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

Upside down catfishBoesemani rainbowfish
Temperature72–79 °F75–82 °F
pH6–7.57–8
Adult size4.0 in4.0 in
Minimum tank30 gal30 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 boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can upside down catfish live with boesemani rainbowfish?

Yes, upside down catfish and boesemani rainbowfish can live together. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and boesemani rainbowfish?

75–79 °F. Upside down catfish need 72–79 °F, boesemani rainbowfish need 75–82 °F.

What size tank do upside down catfish and boesemani rainbowfish need together?

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