Can guppies live with dojo loaches?

Verdict
Yes

Yes, guppies and dojo loaches can live together. Both are fine at 72–77°F. Plan on at least 55 gal.

GuppyGuppy72–82°F · pH 6.8–7.8 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°Guppy 72–82°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.8–7.8Guppy 6.8–7.8Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Guppy · 2 inDojo loach · 6 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

GuppyDojo loach
Temperature72–82 °F59–77 °F
pH6.8–7.86.5–8
Adult size2.0 in6.0 in
Minimum tank10 gal55 gal
TemperamentPeacefulPeaceful
Swims atTopBottom
GroupGroups of 3+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for guppies

All guppy tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can guppies live with dojo loaches?

Yes, guppies and dojo loaches can live together. Both are fine at 72–77°F. Plan on at least 55 gal.

What temperature suits both guppies and dojo loaches?

72–77 °F. Guppies need 72–82 °F, dojo loaches need 59–77 °F.

What size tank do guppies and dojo loaches need together?

At least 55 gal, set by the dojo loach. Add space for each extra fish.