Can cardinal tetras live with dojo loaches?

Verdict
Yes, with care

Yes, with care. Cardinal tetras and dojo loaches can share a tank, but watch one thing. They only share 76–77°F. Keep the heater set there and steady.

Cardinal tetraCardinal tetra76–84°F · pH 4.6–7 Dojo loachDojo loach59–77°F · pH 6.5–8

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–77°Cardinal tetra 76–84°Dojo loach 59–77°
The green band is the temperature range both can live in.
456789Both: 6.5–7Cardinal tetra 4.6–7Dojo loach 6.5–8
The green band is the pH both tolerate.

Size to scale

Cardinal tetra · 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

Cardinal tetraDojo loach
Temperature76–84 °F59–77 °F
pH4.6–76.5–8
Adult size2.0 in6.0 in
Minimum tank20 gal55 gal
TemperamentPeacefulPeaceful
Swims atMiddleBottom
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Better tank mates for dojo loaches

All dojo loach tank mates

Questions

Can cardinal tetras live with dojo loaches?

Yes, with care. Cardinal tetras and dojo loaches can share a tank, but watch one thing. They only share 76–77°F. Keep the heater set there and steady.

What temperature suits both cardinal tetras and dojo loaches?

76–77 °F. Cardinal tetras need 76–84 °F, dojo loaches need 59–77 °F.

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

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