Can upside down catfish live with lemon tetras?

Verdict
Yes

Yes. Upside down catfish and lemon tetras make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 Lemon tetraLemon tetra72–82°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Upside down catfish 72–79°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Upside down catfish 6–7.5Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 inLemon tetra · 2 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 catfishLemon tetra
Temperature72–79 °F72–82 °F
pH6–7.55.5–7.5
Adult size4.0 in2.0 in
Minimum tank30 gal15 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 lemon tetras

All lemon tetra tank mates

Questions

Can upside down catfish live with lemon tetras?

Yes. Upside down catfish and lemon tetras make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and lemon tetras?

72–79 °F. Upside down catfish need 72–79 °F, lemon tetras need 72–82 °F.

What size tank do upside down catfish and lemon tetras need together?

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