Can Harlequin Rasbora and Cuckoo Synodontis live together?

Harlequin Rasbora and Cuckoo Synodontis are possible with care. The comparison on this page runs the same compatibility engine as the tank builder, checking temperature and pH overlap, predation by size, temperament, and known hard-pair conflicts.

Species Comparison

Harlequin Rasbora vs Cuckoo Synodontis

Harlequin Rasbora

Trigonostigma heteromorpha

Cuckoo Synodontis

Synodontis multipunctatus

Verdict:Possible with care

Side-by-side specs

Rasboras

Family

Catfish

2″

Adult size

5″

15gal

Min tank

55gal

72–81°F

Temperature

75–81°F

6–7.5

7.8–9

peaceful

Temperament

semi-aggressive

Schooling

mid

Water level

bottom

Compatibility notes

warnHarlequin Rasbora prefers pH 6–7.5, Cuckoo Synodontis prefers 7.8–9 — water chemistry mismatch.

Try both in the builder →Compare different species