Can paradise fish live with upside down catfish?

Verdict
Yes

Yes, paradise fish and upside down catfish can live together. Both are fine at 72–79°F. Plan on at least 30 gal.

Paradise fishParadise fish61–79°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°Paradise fish 61–79°Upside down catfish 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Paradise fish 6–8Upside down catfish 6–7.5
The green band is the pH both tolerate.

Size to scale

Paradise fish · 3.5 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

Paradise fishUpside down catfish
Temperature61–79 °F72–79 °F
pH6–86–7.5
Adult size3.5 in4.0 in
Minimum tank20 gal30 gal
TemperamentSemi-aggressivePeaceful
Swims atTopBottom
GroupOne per tankGroups of 3+
DietOmnivoreOmnivore

Better tank mates for paradise fish

All paradise fish tank mates

Better tank mates for upside down catfish

All upside down catfish tank mates

Questions

Can paradise fish live with upside down catfish?

Yes, paradise fish and upside down catfish can live together. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both paradise fish and upside down catfish?

72–79 °F. Paradise fish need 61–79 °F, upside down catfish need 72–79 °F.

What size tank do paradise fish and upside down catfish need together?

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