Can otocinclus live with chili rasboras?

Verdict
Yes

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

OtocinclusOtocinclus72–79°F · pH 6–7.5 Chili rasboraChili rasbora75–82°F · pH 4–7

Why it works

Water side by side

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

Size to scale

Otocinclus · 2 inChili rasbora · 0.8 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

OtocinclusChili rasbora
Temperature72–79 °F75–82 °F
pH6–7.54–7
Adult size2.0 in0.8 in
Minimum tank20 gal5 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 6+Groups of 8+
DietHerbivoreCarnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for chili rasboras

All chili rasbora tank mates

Questions

Can otocinclus live with chili rasboras?

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

What temperature suits both otocinclus and chili rasboras?

75–79 °F. Otocinclus need 72–79 °F, chili rasboras need 75–82 °F.

What size tank do otocinclus and chili rasboras need together?

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