Can plecos live with dojo loaches?

Verdict
Yes

Yes, plecos and dojo loaches can live together. Both are fine at 72–77°F. Plan on at least 125 gal.

Common plecoCommon pleco72–86°F · pH 6.5–7.5 Dojo loachDojo loach59–77°F · pH 6.5–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–77°Common pleco 72–86°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Common pleco 6.5–7.5Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Common pleco · 15 inDojo loach · 6 in0"2"4"6"8"10"12"14"
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

Common plecoDojo loach
Temperature72–86 °F59–77 °F
pH6.5–7.56.5–8
Adult size15.0 in6.0 in
Minimum tank125 gal55 gal
TemperamentPeacefulPeaceful
Swims atBottomBottom
GroupAlone or in pairsGroups of 3+
DietHerbivoreOmnivore

Better tank mates for plecos

All common pleco tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can plecos live with dojo loaches?

Yes, plecos and dojo loaches can live together. Both are fine at 72–77°F. Plan on at least 125 gal.

What temperature suits both plecos and dojo loaches?

72–77 °F. Plecos need 72–86 °F, dojo loaches need 59–77 °F.

What size tank do plecos and dojo loaches need together?

At least 125 gal, set by the common pleco. Add space for each extra fish.