Can glowlight tetras live with pencilfish?

Verdict
Yes

Yes, glowlight tetras and pencilfish can live together. Both are fine at 75–80°F. Plan on at least 15 gal.

Glowlight tetraGlowlight tetra74–80°F · pH 6–7.5 PencilfishPencilfish75–82°F · pH 5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Glowlight tetra 74–80°Pencilfish 75–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Glowlight tetra 6–7.5Pencilfish 5–7.5
The green band is the pH both tolerate.

Size to scale

Glowlight tetra · 1.5 inPencilfish · 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

Glowlight tetraPencilfish
Temperature74–80 °F75–82 °F
pH6–7.55–7.5
Adult size1.5 in2.0 in
Minimum tank10 gal15 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for glowlight tetras

All glowlight tetra tank mates

Better tank mates for pencilfish

All pencilfish tank mates

Questions

Can glowlight tetras live with pencilfish?

Yes, glowlight tetras and pencilfish can live together. Both are fine at 75–80°F. Plan on at least 15 gal.

What temperature suits both glowlight tetras and pencilfish?

75–80 °F. Glowlight tetras need 74–80 °F, pencilfish need 75–82 °F.

What size tank do glowlight tetras and pencilfish need together?

At least 15 gal, set by the pencilfish. Add space for each extra fish.