Can upside down catfish live with glowlight tetras?

Verdict
Yes

Yes. Upside down catfish and glowlight tetras get along in the same tank. Both are fine at 74–79°F. Plan on at least 30 gal.

Upside down catfishUpside down catfish72–79°F · pH 6–7.5 Glowlight tetraGlowlight tetra74–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 74–79°Upside down catfish 72–79°Glowlight tetra 74–80°
The green band is the temperature range both can live in.
456789Both: 6–7.5Upside down catfish 6–7.5Glowlight tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Upside down catfish · 4 inGlowlight tetra · 1.5 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 catfishGlowlight tetra
Temperature72–79 °F74–80 °F
pH6–7.56–7.5
Adult size4.0 in1.5 in
Minimum tank30 gal10 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 glowlight tetras

All glowlight tetra tank mates

Questions

Can upside down catfish live with glowlight tetras?

Yes. Upside down catfish and glowlight tetras get along in the same tank. Both are fine at 74–79°F. Plan on at least 30 gal.

What temperature suits both upside down catfish and glowlight tetras?

74–79 °F. Upside down catfish need 72–79 °F, glowlight tetras need 74–80 °F.

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

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