Can glass catfish live with cardinal tetras?

Verdict
Yes

Yes. Glass catfish and cardinal tetras make a good pair. Both are fine at 76–80°F. Plan on at least 30 gal.

Glass catfishGlass catfish75–80°F · pH 6.5–7.5 Cardinal tetraCardinal tetra76–84°F · pH 4.6–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–80°Glass catfish 75–80°Cardinal tetra 76–84°
The green band is the temperature range both can live in.
456789Both: 6.5–7Glass catfish 6.5–7.5Cardinal tetra 4.6–7
The green band is the pH both tolerate.

Size to scale

Glass catfish · 3 inCardinal 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

Glass catfishCardinal tetra
Temperature75–80 °F76–84 °F
pH6.5–7.54.6–7
Adult size3.0 in2.0 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for glass catfish

All glass catfish tank mates

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Questions

Can glass catfish live with cardinal tetras?

Yes. Glass catfish and cardinal tetras make a good pair. Both are fine at 76–80°F. Plan on at least 30 gal.

What temperature suits both glass catfish and cardinal tetras?

76–80 °F. Glass catfish need 75–80 °F, cardinal tetras need 76–84 °F.

What size tank do glass catfish and cardinal tetras need together?

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