Can otocinclus live with boesemani rainbowfish?

Verdict
Yes

Yes, otocinclus and boesemani rainbowfish can live together. Both are fine at 75–79°F. Plan on at least 30 gal.

OtocinclusOtocinclus72–79°F · pH 6–7.5 Boesemani rainbowfishBoesemani rainbowfish75–82°F · pH 7–8

Why it works

Water side by side

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

Size to scale

Otocinclus · 2 inBoesemani rainbowfish · 4 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

OtocinclusBoesemani rainbowfish
Temperature72–79 °F75–82 °F
pH6–7.57–8
Adult size2.0 in4.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulPeaceful
Swims atBottomMiddle
GroupGroups of 6+Groups of 6+
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for boesemani rainbowfish

All boesemani rainbowfish tank mates

Questions

Can otocinclus live with boesemani rainbowfish?

Yes, otocinclus and boesemani rainbowfish can live together. Both are fine at 75–79°F. Plan on at least 30 gal.

What temperature suits both otocinclus and boesemani rainbowfish?

75–79 °F. Otocinclus need 72–79 °F, boesemani rainbowfish need 75–82 °F.

What size tank do otocinclus and boesemani rainbowfish need together?

At least 30 gal, set by the boesemani rainbowfish. Add space for each extra fish.