Can bolivian rams live with otocinclus?

Verdict
Yes

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

Bolivian ramBolivian ram72–79°F · pH 6–7.5 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°Bolivian ram 72–79°Otocinclus 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Bolivian ram 6–7.5Otocinclus 6–7.5
The green band is the pH both tolerate.

Size to scale

Bolivian ram · 3 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

Bolivian ramOtocinclus
Temperature72–79 °F72–79 °F
pH6–7.56–7.5
Adult size3.0 in2.0 in
Minimum tank20 gal20 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupAlone or in pairsGroups of 6+
DietOmnivoreHerbivore

Better tank mates for bolivian rams

All bolivian ram tank mates

Better tank mates for otocinclus

All otocinclus tank mates

Questions

Can bolivian rams live with otocinclus?

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

What temperature suits both bolivian rams and otocinclus?

72–79 °F. Bolivian rams need 72–79 °F, otocinclus need 72–79 °F.

What size tank do bolivian rams and otocinclus need together?

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