Harlequin Rasbora and Keyhole Cichlid Compatibility Overview
Harlequin Rasbora and Keyhole Cichlid can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 75-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Harlequin Rasbora | Keyhole Cichlid | Verdict |
|---|---|---|---|
| Temperature | 72โ81ยฐF | 70โ82ยฐF | โ 72โ81ยฐF |
| pH Range | 5.5โ7.5 | 4.0โ7.5 | โ 5.5โ7.5 |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.75 in | 4.3 in | โ ๏ธ 2.5ร difference |
| Min. Group | 8+ | 2+ | See below |
| Min. Tank Size | 75 gallons (for both species) | โ | |
Compatibility Positives
Caution Points
Species Profiles
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.
โ Full Harlequin Rasbora care guide
Keyhole Cichlid โ Cleithracara maronii
The Keyhole Cichlid is a popular choice for beginners due to its relatively easy care and peaceful temperament. These fish are known for their distinct keyhole marking and vibrant coloration. They do well in a community tank with other peaceful species, but should be provided with plenty of hiding spots to feel secure.
Frequently Asked Questions
Can Harlequin Rasbora live with Keyhole Cichlid?
Yes, in a well-planned setup. Harlequin Rasbora and Keyhole Cichlid can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges. Both species are peaceful, and neither poses a major aggression risk to the other. A minimum 75-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Harlequin Rasbora and Keyhole Cichlid together?
A minimum of 75 gallons is recommended for keeping Harlequin Rasbora and Keyhole Cichlid together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Harlequin Rasbora and Keyhole Cichlid?
72โ81ยฐF โ inside Harlequin Rasbora's 72โ81ยฐF and Keyhole Cichlid's 70โ82ยฐF.
Is a Harlequin Rasbora aggressive toward a Keyhole Cichlid?
Harlequin Rasbora is peaceful and Keyhole Cichlid is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Harlequin Rasbora and Keyhole Cichlid
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 75 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 125 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 150 gal | Best when keeping larger schools or reducing territorial pressure. |