Can oscars live with harlequin rasboras?
Verdict
No
No. Oscars and harlequin rasboras should not share a tank. An adult oscar eats fish that fit in its mouth, and at 2 inches harlequin rasboras do.
What to watch
- Deal breakerAn adult oscar eats fish that fit in its mouth, and at 2 inches harlequin rasboras do.
- Watch outOscars grow to 12 inches and need 75 gallons, far more than a tank set up for harlequin rasboras.
What works
- Both are fine at 74–80°F.
- pH 6–7.5 suits both.
Water side by side
Size to scale
Care at a glance
| Oscar | Harlequin rasbora | |
|---|---|---|
| Temperature | 74–81 °F | 72–80 °F |
| pH | 6–8 | 6–7.5 |
| Adult size | 12.0 in | 2.0 in |
| Minimum tank | 75 gal | 10 gal |
| Temperament | Semi-aggressive | Peaceful |
| Swims at | Middle | Middle |
| Group | Alone or in pairs | Groups of 6+ |
| Diet | Carnivore | Omnivore |
Better tank mates for oscars
Common plecoYes
Clown loachYes
Black ghost knifeYes
BichirYes
Elephant nose fishYes
Chinese algae eaterYes
Better tank mates for harlequin rasboras
All harlequin rasbora tank mates
Questions
Can oscars live with harlequin rasboras?
No. Oscars and harlequin rasboras should not share a tank. An adult oscar eats fish that fit in its mouth, and at 2 inches harlequin rasboras do.
What temperature suits both oscars and harlequin rasboras?
74–80 °F. Oscars need 74–81 °F, harlequin rasboras need 72–80 °F.
What size tank do oscars and harlequin rasboras need together?
At least 75 gal, set by the oscar. Add space for each extra fish.