Can severums live with harlequin rasboras?

Verdict

Yes, with care

Yes, with care. Severums and harlequin rasboras can share a tank, but watch one thing. A grown severum may treat small harlequin rasboras as food, especially at night.

Severum74–84°F · pH 6–7

Harlequin rasbora72–80°F · pH 6–7.5

What to watch

Watch outA grown severum may treat small harlequin rasboras as food, especially at night.

What works

Both are fine at 74–80°F.
pH 6–7 suits both.

Water side by side

The green band is the temperature range both can live in.

The green band is the pH both tolerate.

Size to scale

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

	Severum	Harlequin rasbora
Temperature	74–84 °F	72–80 °F
pH	6–7	6–7.5
Adult size	8.0 in	2.0 in
Minimum tank	55 gal	10 gal
Temperament	Semi-aggressive	Peaceful
Swims at	Middle	Middle
Group	Alone or in pairs	Groups of 6+
Diet	Omnivore	Omnivore

Better tank mates for severums

All severum tank mates

Better tank mates for harlequin rasboras

All harlequin rasbora tank mates

Questions

Can severums live with harlequin rasboras?

Yes, with care. Severums and harlequin rasboras can share a tank, but watch one thing. A grown severum may treat small harlequin rasboras as food, especially at night.

What temperature suits both severums and harlequin rasboras?

74–80 °F. Severums need 74–84 °F, harlequin rasboras need 72–80 °F.

What size tank do severums and harlequin rasboras need together?

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