Can harlequin rasboras live with paradise fish?

Verdict
Yes

Yes, harlequin rasboras and paradise fish can live together. Both are fine at 72–79°F. Plan on at least 20 gal.

Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5 Paradise fishParadise fish61–79°F · pH 6–8

Why it works

Water side by side

55°60°65°70°75°80°85°90°Both: 72–79°Harlequin rasbora 72–80°Paradise fish 61–79°
The green band is the temperature range both can live in.
456789Both: 6–7.5Harlequin rasbora 6–7.5Paradise fish 6–8
The green band is the pH both tolerate.

Size to scale

Harlequin rasbora · 2 inParadise fish · 3.5 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 rasboraParadise fish
Temperature72–80 °F61–79 °F
pH6–7.56–8
Adult size2.0 in3.5 in
Minimum tank10 gal20 gal
TemperamentPeacefulSemi-aggressive
Swims atMiddleTop
GroupGroups of 6+One per tank
DietOmnivoreOmnivore

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Better tank mates for paradise fish

All paradise fish tank mates

Questions

Can harlequin rasboras live with paradise fish?

Yes, harlequin rasboras and paradise fish can live together. Both are fine at 72–79°F. Plan on at least 20 gal.

What temperature suits both harlequin rasboras and paradise fish?

72–79 °F. Harlequin rasboras need 72–80 °F, paradise fish need 61–79 °F.

What size tank do harlequin rasboras and paradise fish need together?

At least 20 gal, set by the paradise fish. Add space for each extra fish.