Can peacock cichlids live with harlequin rasboras?

Verdict
Yes, with care

Yes, with care. Peacock cichlids and harlequin rasboras can share a tank, but watch one thing. Different water: peacock cichlids want pH 7.8–8.6, harlequin rasboras want pH 6–7.5.

Peacock cichlidPeacock cichlid76–82°F · pH 7.8–8.6 Harlequin rasboraHarlequin rasbora72–80°F · pH 6–7.5

What to watch

What works

Water side by side

55°60°65°70°75°80°85°90°Both: 76–80°Peacock cichlid 76–82°Harlequin rasbora 72–80°
The green band is the temperature range both can live in.
456789Peacock cichlid 7.8–8.6Harlequin rasbora 6–7.5
No pH suits both. One would live in the wrong water all the time.

Size to scale

Peacock cichlid · 6 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

Peacock cichlidHarlequin rasbora
Temperature76–82 °F72–80 °F
pH7.8–8.66–7.5
Adult size6.0 in2.0 in
Minimum tank55 gal10 gal
TemperamentSemi-aggressivePeaceful
Swims atMiddleMiddle
GroupGroups of 4+Groups of 6+
DietCarnivoreOmnivore

Better tank mates for peacock cichlids

All peacock cichlid tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can peacock cichlids live with harlequin rasboras?

Yes, with care. Peacock cichlids and harlequin rasboras can share a tank, but watch one thing. Different water: peacock cichlids want pH 7.8–8.6, harlequin rasboras want pH 6–7.5.

What temperature suits both peacock cichlids and harlequin rasboras?

76–80 °F. Peacock cichlids need 76–82 °F, harlequin rasboras need 72–80 °F.

What size tank do peacock cichlids and harlequin rasboras need together?

At least 55 gal, set by the peacock cichlid. Add space for each extra fish.