Can harlequin rasboras live with endlers?

Verdict
Yes

Yes, harlequin rasboras and endlers can live together. Both are fine at 72–80°F. Plan on at least 10 gal.

Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5 Endler's livebearerEndler's livebearer72–82°F · pH 7–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–80°Harlequin rasbora 72–80°Endler's livebearer 72–82°
The green band is the temperature range both can live in.
456789Both: 7–7.5Harlequin rasbora 6–7.5Endler's livebearer 7–8
The green band is the pH both tolerate.

Size to scale

Harlequin rasbora · 2 inEndler's livebearer · 1 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

Harlequin rasboraEndler's livebearer
Temperature72–80 °F72–82 °F
pH6–7.57–8
Adult size2.0 in1.0 in
Minimum tank10 gal5 gal
TemperamentPeacefulPeaceful
Swims atMiddleTop
GroupGroups of 6+Groups of 3+
DietOmnivoreOmnivore

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Better tank mates for endlers

All endler's livebearer tank mates

Questions

Can harlequin rasboras live with endlers?

Yes, harlequin rasboras and endlers can live together. Both are fine at 72–80°F. Plan on at least 10 gal.

What temperature suits both harlequin rasboras and endlers?

72–80 °F. Harlequin rasboras need 72–80 °F, endlers need 72–82 °F.

What size tank do harlequin rasboras and endlers need together?

At least 10 gal, set by the harlequin rasbora. Add space for each extra fish.