Can otocinclus live with blue gouramis?

Verdict
Yes

Yes. Otocinclus and blue gouramis get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

OtocinclusOtocinclus72–79°F · pH 6–7.5 Blue gouramiBlue gourami72–82°F · pH 6–8

Why it works

Water side by side

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

Size to scale

Otocinclus · 2 inBlue gourami · 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

OtocinclusBlue gourami
Temperature72–79 °F72–82 °F
pH6–7.56–8
Adult size2.0 in5.0 in
Minimum tank20 gal30 gal
TemperamentPeacefulSemi-aggressive
Swims atBottomTop
GroupGroups of 6+Alone or in pairs
DietHerbivoreOmnivore

Better tank mates for otocinclus

All otocinclus tank mates

Better tank mates for blue gouramis

All blue gourami tank mates

Questions

Can otocinclus live with blue gouramis?

Yes. Otocinclus and blue gouramis get along in the same tank. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both otocinclus and blue gouramis?

72–79 °F. Otocinclus need 72–79 °F, blue gouramis need 72–82 °F.

What size tank do otocinclus and blue gouramis need together?

At least 30 gal, set by the blue gourami. Add space for each extra fish.