Can zebra danios live with upside down catfish?

Verdict
Yes

Yes. Zebra danios and upside down catfish make a good pair. Both are fine at 72–77°F. Plan on at least 30 gal.

Zebra danioZebra danio65–77°F · pH 6.5–8 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: 72–77°Zebra danio 65–77°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Zebra danio 6.5–8Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Zebra danio · 2 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

Zebra danioUpside down catfish
Temperature65–77 °F72–79 °F
pH6.5–86–7.5
Adult size2.0 in4.0 in
Minimum tank10 gal30 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for zebra danios

All zebra danio tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can zebra danios live with upside down catfish?

Yes. Zebra danios and upside down catfish make a good pair. Both are fine at 72–77°F. Plan on at least 30 gal.

What temperature suits both zebra danios and upside down catfish?

72–77 °F. Zebra danios need 65–77 °F, upside down catfish need 72–79 °F.

What size tank do zebra danios and upside down catfish need together?

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