Can otocinclus live with pygmy corys?

Verdict
Yes

Yes. Otocinclus and pygmy corys get along in the same tank. Both are fine at 72–79°F. Plan on at least 20 gal.

OtocinclusOtocinclus72–79°F · pH 6–7.5 Pygmy coryPygmy cory72–79°F · pH 6–7.5

Why it works

Water side by side

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

Size to scale

Otocinclus · 2 inPygmy cory · 1 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

OtocinclusPygmy cory
Temperature72–79 °F72–79 °F
pH6–7.56–7.5
Adult size2.0 in1.0 in
Minimum tank20 gal10 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 6+Groups of 6+
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for pygmy corys

All pygmy cory tank mates

Questions

Can otocinclus live with pygmy corys?

Yes. Otocinclus and pygmy corys get along in the same tank. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both otocinclus and pygmy corys?

72–79 °F. Otocinclus need 72–79 °F, pygmy corys need 72–79 °F.

What size tank do otocinclus and pygmy corys need together?

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