Can harlequin rasboras live with lemon tetras?

Verdict
Yes

Yes. Harlequin rasboras and lemon tetras make a good pair. Both are fine at 72–80°F. Plan on at least 15 gal.

Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5 Lemon tetraLemon tetra72–82°F · pH 5.5–7.5

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–80°Harlequin rasbora 72–80°Lemon tetra 72–82°
The green band is the temperature range both can live in.
456789Both: 6–7.5Harlequin rasbora 6–7.5Lemon tetra 5.5–7.5
The green band is the pH both tolerate.

Size to scale

Harlequin rasbora · 2 inLemon 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

Harlequin rasboraLemon tetra
Temperature72–80 °F72–82 °F
pH6–7.55.5–7.5
Adult size2.0 in2.0 in
Minimum tank10 gal15 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Better tank mates for lemon tetras

All lemon tetra tank mates

Questions

Can harlequin rasboras live with lemon tetras?

Yes. Harlequin rasboras and lemon tetras make a good pair. Both are fine at 72–80°F. Plan on at least 15 gal.

What temperature suits both harlequin rasboras and lemon tetras?

72–80 °F. Harlequin rasboras need 72–80 °F, lemon tetras need 72–82 °F.

What size tank do harlequin rasboras and lemon tetras need together?

At least 15 gal, set by the lemon tetra. Add space for each extra fish.