Can otocinclus live with endlers?

Verdict
Yes

Yes. Otocinclus and endlers make a good pair. Both are fine at 72–79°F. Plan on at least 20 gal.

OtocinclusOtocinclus72–79°F · pH 6–7.5 Endler's livebearerEndler's livebearer72–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Otocinclus 72–79°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Otocinclus 6–7.5Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Otocinclus · 2 inEndler's livebearer · 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

OtocinclusEndler's livebearer
Temperature72–79 °F72–82 °F
pH6–7.57–8
Adult size2.0 in1.0 in
Minimum tank20 gal5 gal
TemperamentPeacefulPeaceful
Swims atBottomTop
GroupGroups of 6+Groups of 3+
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can otocinclus live with endlers?

Yes. Otocinclus and endlers make a good pair. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both otocinclus and endlers?

72–79 °F. Otocinclus need 72–79 °F, endlers need 72–82 °F.

What size tank do otocinclus and endlers need together?

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