Can upside down catfish live with clown plecos?

Verdict
Yes

Yes, upside down catfish and clown plecos can live together. Both are fine at 73–79°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 Clown plecoClown pleco73–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Upside down catfish 72–79°Clown pleco 73–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Upside down catfish 6–7.5Clown pleco 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 inClown pleco · 3.5 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 catfishClown pleco
Temperature72–79 °F73–82 °F
pH6–7.56.5–7.5
Adult size4.0 in3.5 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupGroups of 3+Alone or in pairs
DietOmnivoreHerbivore

Better tank mates for upside down catfish

All upside down catfish tank mates

Better tank mates for clown plecos

All clown pleco tank mates

Questions

Can upside down catfish live with clown plecos?

Yes, upside down catfish and clown plecos can live together. Both are fine at 73–79°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and clown plecos?

73–79 °F. Upside down catfish need 72–79 °F, clown plecos need 73–82 °F.

What size tank do upside down catfish and clown plecos need together?

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