Can pearl gouramis live with otocinclus?

Verdict
Yes

Yes. Pearl gouramis and otocinclus get along in the same tank. Both are fine at 77–79°F. Plan on at least 30 gal.

Pearl gouramiPearl gourami77–82°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: 77–79°Pearl gourami 77–82°Otocinclus 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Pearl gourami 6–7.5Otocinclus 6–7.5
The green band is the pH both tolerate.

Size to scale

Pearl gourami · 5 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

Pearl gouramiOtocinclus
Temperature77–82 °F72–79 °F
pH6–7.56–7.5
Adult size5.0 in2.0 in
Minimum tank30 gal20 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupAlone or in pairsGroups of 6+
DietOmnivoreHerbivore

Better tank mates for pearl gouramis

All pearl gourami tank mates

Better tank mates for otocinclus

All otocinclus tank mates

Questions

Can pearl gouramis live with otocinclus?

Yes. Pearl gouramis and otocinclus get along in the same tank. Both are fine at 77–79°F. Plan on at least 30 gal.

What temperature suits both pearl gouramis and otocinclus?

77–79 °F. Pearl gouramis need 77–82 °F, otocinclus need 72–79 °F.

What size tank do pearl gouramis and otocinclus need together?

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