Can yoyo loaches live with cardinal tetras?

Verdict
Yes

Yes, yoyo loaches and cardinal tetras can live together. Both are fine at 76–84°F. Plan on at least 40 gal.

Yoyo loachYoyo loach75–86°F · pH 6–7.5 Cardinal tetraCardinal tetra76–84°F · pH 4.6–7

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–84°Yoyo loach 75–86°Cardinal tetra 76–84°
The green band is the temperature range both can live in.
456789Both: 6–7Yoyo loach 6–7.5Cardinal tetra 4.6–7
The green band is the pH both tolerate.

Size to scale

Yoyo loach · 5 inCardinal tetra · 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

Yoyo loachCardinal tetra
Temperature75–86 °F76–84 °F
pH6–7.54.6–7
Adult size5.0 in2.0 in
Minimum tank40 gal20 gal
TemperamentSemi-aggressivePeaceful
Swims atBottomMiddle
GroupGroups of 5+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for yoyo loaches

All yoyo loach tank mates

Better tank mates for cardinal tetras

All cardinal tetra tank mates

Questions

Can yoyo loaches live with cardinal tetras?

Yes, yoyo loaches and cardinal tetras can live together. Both are fine at 76–84°F. Plan on at least 40 gal.

What temperature suits both yoyo loaches and cardinal tetras?

76–84 °F. Yoyo loaches need 75–86 °F, cardinal tetras need 76–84 °F.

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

At least 40 gal, set by the yoyo loach. Add space for each extra fish.