Poor pairing in a typical community
Oscar may view a much smaller Harlequin Rasbora as prey when fully grown.
Practical response: Use similarly sized robust tankmates.
Harlequin Rasbora
- Adult size
- 4.5 cm / 1.8 in
- Tank reference
- 50+ L / 13.2+ US gal
- Group
- 8+
- Zone
- mid
- Temperature
- 22–28°C / 71.6–82.4°F
Oscar
- Adult size
- 35 cm / 13.8 in
- Tank reference
- 280+ L / 74+ US gal
- Group
- 1+
- Zone
- mid
- Temperature
- 23–28°C / 73.4–82.4°F
Water parameter overlap
Behavior and space
A reliable community shoaler that appreciates plants around open swimming space. A large predatory cichlid with heavy waste production and substantial space requirements.
A compatibility answer should also consider the actual tank dimensions, number of each fish, filtration, planting and other occupants. Two species can be reasonable together in a long, structured aquarium yet become a poor pairing when compressed into a small footprint.
Common questions
Can Harlequin Rasbora live with Oscar?
The StockingLab verdict is avoid: Oscar may view a much smaller Harlequin Rasbora as prey when fully grown.
Do their temperatures overlap?
23–28°C / 73.4–82.4°F shared range.
Should I trust compatibility calculators completely?
No. Individual behavior, sex ratios, breeding condition, aquascape and tank size can change the outcome. Use the result to identify risks, then verify care requirements before purchase.