Can crayfish live with glowlight tetras?

Verdict
Yes

Yes. Crayfish and glowlight tetras make a good pair. Both are fine at 74–77°F. Plan on at least 20 gal.

CrayfishCrayfish65–77°F · pH 6.5–8 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: 74–77°Crayfish 65–77°Glowlight tetra 74–80°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Crayfish 6.5–8Glowlight tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Crayfish · 5 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

CrayfishGlowlight tetra
Temperature65–77 °F74–80 °F
pH6.5–86–7.5
Adult size5.0 in1.5 in
Minimum tank20 gal10 gal
TemperamentAggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 6+
DietOmnivoreOmnivore

Better tank mates for crayfish

All crayfish tank mates

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Questions

Can crayfish live with glowlight tetras?

Yes. Crayfish and glowlight tetras make a good pair. Both are fine at 74–77°F. Plan on at least 20 gal.

What temperature suits both crayfish and glowlight tetras?

74–77 °F. Crayfish need 65–77 °F, glowlight tetras need 74–80 °F.

What size tank do crayfish and glowlight tetras need together?

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