Blue Tang and Harlequin Rasbora Compatibility Overview
Blue Tang and Harlequin Rasbora are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. Their pH ranges do not meet: Blue Tang wants 8.1โ8.4 and Harlequin Rasbora wants 5.5โ7.5. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Blue Tang | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 72โ82ยฐF | 72โ81ยฐF | โ 72โ81ยฐF |
| pH Range | 8.1โ8.4 | 5.5โ7.5 | โ No overlap |
| Temperament | semi | peaceful | โ ๏ธ Monitor |
| Adult Size | 12.0 in | 1.75 in | โ 7ร difference |
| Min. Group | 1+ | 8+ | See below |
| Min. Tank Size | 100 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Blue Tang โ Paracanthurus hepatus
The Blue Tang is a popular saltwater fish known for its vibrant blue color and yellow stripes. These fish are generally peaceful and can be kept in a community tank with other non-aggressive species. They require a well-maintained, spacious tank with plenty of swimming space and hiding spots.
Harlequin Rasbora โ Trigonostigma heteromorpha
Active mid-level schooling fish with a distinctive black triangular patch. One of the best all-around community tank fish.
Frequently Asked Questions
Can Blue Tang live with Harlequin Rasbora?
Generally not recommended. Blue Tang and Harlequin Rasbora are generally not recommended to be housed together. One of these is a marine species and the other is not; they cannot share one aquarium. Their pH ranges do not meet: Blue Tang wants 8.1โ8.4 and Harlequin Rasbora wants 5.5โ7.5. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Blue Tang and Harlequin Rasbora together?
A minimum of 100 gallons is recommended for keeping Blue Tang and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Blue Tang and Harlequin Rasbora?
72โ81ยฐF โ inside Blue Tang's 72โ82ยฐF and Harlequin Rasbora's 72โ81ยฐF.
Is a Blue Tang aggressive toward a Harlequin Rasbora?
Blue Tang is semi and Harlequin Rasbora is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Blue Tang and Harlequin Rasbora
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 180 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 300 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 350 gal | Best when keeping larger schools or reducing territorial pressure. |