Can yoyo loaches live with harlequin rasboras?

Verdict
Yes

Yes. Yoyo loaches and harlequin rasboras get along in the same tank. Both are fine at 75–80°F. Plan on at least 40 gal.

Yoyo loachYoyo loach75–86°F · pH 6–7.5 Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 75–80°Yoyo loach 75–86°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Both: 6–7.5Yoyo loach 6–7.5Harlequin rasbora 6–7.5
The green band is the pH both tolerate.

Size to scale

Yoyo loach · 5 inHarlequin rasbora · 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 loachHarlequin rasbora
Temperature75–86 °F72–80 °F
pH6–7.56–7.5
Adult size5.0 in2.0 in
Minimum tank40 gal10 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 harlequin rasboras

All harlequin rasbora tank mates

Questions

Can yoyo loaches live with harlequin rasboras?

Yes. Yoyo loaches and harlequin rasboras get along in the same tank. Both are fine at 75–80°F. Plan on at least 40 gal.

What temperature suits both yoyo loaches and harlequin rasboras?

75–80 °F. Yoyo loaches need 75–86 °F, harlequin rasboras need 72–80 °F.

What size tank do yoyo loaches and harlequin rasboras need together?

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