Can chili rasboras live with serpae tetras?

Verdict
Yes

Yes. Chili rasboras and serpae tetras make a good pair. Both are fine at 75–79°F. Plan on at least 20 gal.

Chili rasboraChili rasbora75–82°F · pH 4–7 Serpae tetraSerpae tetra72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–79°Chili rasbora 75–82°Serpae tetra 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7Chili rasbora 4–7Serpae tetra 6–7.5
The green band is the pH both tolerate.

Size to scale

Chili rasbora · 0.8 inSerpae tetra · 1.75 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 rasboraSerpae tetra
Temperature75–82 °F72–79 °F
pH4–76–7.5
Adult size0.8 in1.75 in
Minimum tank5 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleMiddle
GroupGroups of 8+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for chili rasboras

All chili rasbora tank mates

Better tank mates for serpae tetras

All serpae tetra tank mates

Questions

Can chili rasboras live with serpae tetras?

Yes. Chili rasboras and serpae tetras make a good pair. Both are fine at 75–79°F. Plan on at least 20 gal.

What temperature suits both chili rasboras and serpae tetras?

75–79 °F. Chili rasboras need 75–82 °F, serpae tetras need 72–79 °F.

What size tank do chili rasboras and serpae tetras need together?

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