Can congo tetras live with dojo loaches?

Verdict
Yes

Yes. Congo tetras and dojo loaches make a good pair. Both are fine at 73–77°F. Plan on at least 55 gal.

Congo tetraCongo tetra73–82°F · pH 6–7.5 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: 73–77°Congo tetra 73–82°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Congo tetra 6–7.5Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Congo tetra · 3 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

Congo tetraDojo loach
Temperature73–82 °F59–77 °F
pH6–7.56.5–8
Adult size3.0 in6.0 in
Minimum tank30 gal55 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for congo tetras

All congo tetra tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can congo tetras live with dojo loaches?

Yes. Congo tetras and dojo loaches make a good pair. Both are fine at 73–77°F. Plan on at least 55 gal.

What temperature suits both congo tetras and dojo loaches?

73–77 °F. Congo tetras need 73–82 °F, dojo loaches need 59–77 °F.

What size tank do congo tetras and dojo loaches need together?

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