Can corydoras live with otocinclus?

Verdict
Yes

Yes, corydoras and otocinclus can live together. Both are fine at 72–79°F. Plan on at least 20 gal.

CorydorasCorydoras72–79°F · pH 6–7.8 OtocinclusOtocinclus72–79°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Corydoras 72–79°Otocinclus 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Corydoras 6–7.8Otocinclus 6–7.5
The green band is the pH both tolerate.

Size to scale

Corydoras · 2.5 inOtocinclus · 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

CorydorasOtocinclus
Temperature72–79 °F72–79 °F
pH6–7.86–7.5
Adult size2.5 in2.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupGroups of 6+Groups of 6+
DietOmnivoreHerbivore

Better tank mates for corydoras

All corydoras tank mates

Better tank mates for otocinclus

All otocinclus tank mates

Questions

Can corydoras live with otocinclus?

Yes, corydoras and otocinclus can live together. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both corydoras and otocinclus?

72–79 °F. Corydoras need 72–79 °F, otocinclus need 72–79 °F.

What size tank do corydoras and otocinclus need together?

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