Can chili rasboras live with pencilfish?

Verdict
Yes

Yes, chili rasboras and pencilfish can live together. Both are fine at 75–82°F. Plan on at least 15 gal.

Chili rasboraChili rasbora75–82°F · pH 4–7 PencilfishPencilfish75–82°F · pH 5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–82°Chili rasbora 75–82°Pencilfish 75–82°
The green band is the temperature range both can live in.
456789Both: 5–7Chili rasbora 4–7Pencilfish 5–7.5
The green band is the pH both tolerate.

Size to scale

Chili rasbora · 0.8 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

Chili rasboraPencilfish
Temperature75–82 °F75–82 °F
pH4–75–7.5
Adult size0.8 in2.0 in
Minimum tank5 gal15 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 8+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for chili rasboras

All chili rasbora tank mates

Better tank mates for pencilfish

All pencilfish tank mates

Questions

Can chili rasboras live with pencilfish?

Yes, chili rasboras and pencilfish can live together. Both are fine at 75–82°F. Plan on at least 15 gal.

What temperature suits both chili rasboras and pencilfish?

75–82 °F. Chili rasboras need 75–82 °F, pencilfish need 75–82 °F.

What size tank do chili rasboras and pencilfish need together?

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