Can otocinclus live with lemon tetras?

Verdict
Yes

Yes. Otocinclus and lemon tetras 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 Lemon tetraLemon tetra72–82°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Otocinclus 72–79°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Otocinclus 6–7.5Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Otocinclus · 2 inLemon tetra · 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

OtocinclusLemon tetra
Temperature72–79 °F72–82 °F
pH6–7.55.5–7.5
Adult size2.0 in2.0 in
Minimum tank20 gal15 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 6+Groups of 6+
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for lemon tetras

All lemon tetra tank mates

Questions

Can otocinclus live with lemon tetras?

Yes. Otocinclus and lemon tetras 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 lemon tetras?

72–79 °F. Otocinclus need 72–79 °F, lemon tetras need 72–82 °F.

What size tank do otocinclus and lemon tetras need together?

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