Can zebra danios live with harlequin rasboras?

Verdict
Yes

Yes, zebra danios and harlequin rasboras can live together. Both are fine at 72–77°F. Plan on at least 10 gal.

Zebra danioZebra danio65–77°F · pH 6.5–8 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: 72–77°Zebra danio 65–77°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Both: 6.5–7.5Zebra danio 6.5–8Harlequin rasbora 6–7.5
The green band is the pH both tolerate.

Size to scale

Zebra danio · 2 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

Zebra danioHarlequin rasbora
Temperature65–77 °F72–80 °F
pH6.5–86–7.5
Adult size2.0 in2.0 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atTopMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for zebra danios

All zebra danio tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can zebra danios live with harlequin rasboras?

Yes, zebra danios and harlequin rasboras can live together. Both are fine at 72–77°F. Plan on at least 10 gal.

What temperature suits both zebra danios and harlequin rasboras?

72–77 °F. Zebra danios need 65–77 °F, harlequin rasboras need 72–80 °F.

What size tank do zebra danios and harlequin rasboras need together?

At least 10 gal, set by the zebra danio. Add space for each extra fish.