Can tiger barbs live with otocinclus?

Verdict
Yes

Yes. Tiger barbs and otocinclus make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Tiger barb 72–81°Otocinclus 72–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Tiger barb 6–7.5Otocinclus 6–7.5
The green band is the pH both tolerate.

Size to scale

Tiger barb · 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

Tiger barbOtocinclus
Temperature72–81 °F72–79 °F
pH6–7.56–7.5
Adult size3.0 in2.0 in
Minimum tank30 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleBottom
GroupGroups of 6+Groups of 6+
DietOmnivoreHerbivore

Better tank mates for tiger barbs

All tiger barb tank mates

Better tank mates for otocinclus

All otocinclus tank mates

Questions

Can tiger barbs live with otocinclus?

Yes. Tiger barbs and otocinclus make a good pair. Both are fine at 72–79°F. Plan on at least 30 gal.

What temperature suits both tiger barbs and otocinclus?

72–79 °F. Tiger barbs need 72–81 °F, otocinclus need 72–79 °F.

What size tank do tiger barbs and otocinclus need together?

At least 30 gal, set by the tiger barb. Add space for each extra fish.