Can otocinclus live with clown plecos?

Verdict
Yes

Yes, otocinclus and clown plecos can live together. Both are fine at 73–79°F. Plan on at least 20 gal.

OtocinclusOtocinclus72–79°F · pH 6–7.5 Clown plecoClown pleco73–82°F · pH 6.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 73–79°Otocinclus 72–79°Clown pleco 73–82°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Otocinclus 6–7.5Clown pleco 6.5–7.5
The green band is the pH both tolerate.

Size to scale

Otocinclus · 2 inClown pleco · 3.5 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

OtocinclusClown pleco
Temperature72–79 °F73–82 °F
pH6–7.56.5–7.5
Adult size2.0 in3.5 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupGroups of 6+Alone or in pairs
DietHerbivoreHerbivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for clown plecos

All clown pleco tank mates

Questions

Can otocinclus live with clown plecos?

Yes, otocinclus and clown plecos can live together. Both are fine at 73–79°F. Plan on at least 20 gal.

What temperature suits both otocinclus and clown plecos?

73–79 °F. Otocinclus need 72–79 °F, clown plecos need 73–82 °F.

What size tank do otocinclus and clown plecos need together?

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