Can neon tetras live with harlequin rasboras?

Verdict
Yes

Yes, neon tetras and harlequin rasboras can live together. Both are fine at 72–79°F. Plan on at least 10 gal.

Neon tetraNeon tetra72–79°F · pH 6–7 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: 72–79°Neon tetra 72–79°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Both: 6–7Neon tetra 6–7Harlequin rasbora 6–7.5
The green band is the pH both tolerate.

Size to scale

Neon tetra · 1.5 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

Neon tetraHarlequin rasbora
Temperature72–79 °F72–80 °F
pH6–76–7.5
Adult size1.5 in2.0 in
Minimum tank10 gal10 gal
TemperamentPeacefulPeaceful
Swims atMiddleMiddle
GroupGroups of 6+Groups of 6+
DietOmnivoreOmnivore

Better tank mates for neon tetras

All neon tetra tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can neon tetras live with harlequin rasboras?

Yes, neon tetras and harlequin rasboras can live together. Both are fine at 72–79°F. Plan on at least 10 gal.

What temperature suits both neon tetras and harlequin rasboras?

72–79 °F. Neon tetras need 72–79 °F, harlequin rasboras need 72–80 °F.

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

At least 10 gal, set by the neon tetra. Add space for each extra fish.