Can red tail sharks live with glowlight tetras?

Verdict
Yes

Yes. Red tail sharks and glowlight tetras get along in the same tank. Both are fine at 74–79°F. Plan on at least 55 gal.

Red tail sharkRed tail shark72–79°F · pH 6.5–7.5 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°Red tail shark 72–79°Glowlight tetra 74–80°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Red tail shark 6.5–7.5Glowlight tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Red tail shark · 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

Red tail sharkGlowlight tetra
Temperature72–79 °F74–80 °F
pH6.5–7.56–7.5
Adult size5.0 in1.5 in
Minimum tank55 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomMiddle
GroupOne per tankGroups of 6+
DietOmnivoreOmnivore

Better tank mates for red tail sharks

All red tail shark tank mates

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Questions

Can red tail sharks live with glowlight tetras?

Yes. Red tail sharks and glowlight tetras get along in the same tank. Both are fine at 74–79°F. Plan on at least 55 gal.

What temperature suits both red tail sharks and glowlight tetras?

74–79 °F. Red tail sharks need 72–79 °F, glowlight tetras need 74–80 °F.

What size tank do red tail sharks and glowlight tetras need together?

At least 55 gal, set by the red tail shark. Add space for each extra fish.