Can cardinal tetras live with glofish?

Verdict
Yes

Yes. Cardinal tetras and glofish get along in the same tank. Both are fine at 76–80°F. Plan on at least 20 gal.

Cardinal tetraCardinal tetra76–84°F · pH 4.6–7 GloFish tetraGloFish tetra72–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–80°Cardinal tetra 76–84°GloFish tetra 72–80°
The green band is the temperature range both can live in.
456789Both: 6–7Cardinal tetra 4.6–7GloFish tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Cardinal tetra · 2 inGloFish tetra · 2.5 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

Cardinal tetraGloFish tetra
Temperature76–84 °F72–80 °F
pH4.6–76–7.5
Adult size2.0 in2.5 in
Minimum tank20 gal15 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Better tank mates for glofish

All glofish tetra tank mates

Questions

Can cardinal tetras live with glofish?

Yes. Cardinal tetras and glofish get along in the same tank. Both are fine at 76–80°F. Plan on at least 20 gal.

What temperature suits both cardinal tetras and glofish?

76–80 °F. Cardinal tetras need 76–84 °F, glofish need 72–80 °F.

What size tank do cardinal tetras and glofish need together?

At least 20 gal, set by the cardinal tetra. Add space for each extra fish.