Compatibility Overview
Coral Beauty and Harlequin Rasbora are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
| Factor | Coral Beauty | Harlequin Rasbora | Verdict |
|---|---|---|---|
| Temperature | 75–81°F | 72–81°F | ✅ 75–81°F |
| pH Range | 8.0–8.3 | 5.5–7.5 | ❌ No overlap |
| Temperament | semi | peaceful | ⚠️ Monitor |
| Adult Size | 2.4 in | 1.75 in | ✅ Similar |
| Min. Group | 1+ | 8+ | See below |
| Min. Tank Size | 55 gallons (for both species) | — | |
✅ Compatibility Positives
❌ Incompatibility Reasons
Species Profiles
Coral Beauty — Aquarium species
The Coral Beauty Angelfish is a popular choice for reef tanks due to its vibrant colors and gentle demeanor. These fish thrive in well-maintained aquariums with plenty of swimming space and hiding spots. They are generally peaceful with other compatible fish but can be sensitive to aggressive tankmates. A diet rich in variety is essential for their health.
→ Full Coral Beauty care guide
Harlequin Rasbora — 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 Coral Beauty live with Harlequin Rasbora?
Generally not recommended. Coral Beauty and Harlequin Rasbora are generally not recommended to be housed together. The issues listed above — whether water parameter incompatibility, predation risk, or aggression — create conditions where one or both fish are likely to suffer harm or chronic stress.
What tank size do I need for Coral Beauty and Harlequin Rasbora together?
A minimum of 55 gallons is recommended for keeping Coral Beauty and Harlequin Rasbora together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Coral Beauty and Harlequin Rasbora?
75–81°F
Is a Coral Beauty aggressive toward a Harlequin Rasbora?
Coral Beauty is semi and Harlequin Rasbora is peaceful. These animals require different water types and cannot share one aquarium.
Related Compatibility Guides
Compatibility score breakdown
The overall score is weighted across water chemistry, behavior, adult size, swimming zone, and social needs. A score is a planning aid—not a guarantee for individual fish.
| Factor | Score |
|---|---|
| Temperature | 100/100 |
| Ph | 0/100 |
| Temperament | 75/100 |
| Adult Size | 100/100 |
| Swim Zone | 68/100 |
| Social Needs | 92/100 |
Tank size scenarios
Use the scenario that matches the actual group sizes and temperament you plan to keep.
| Scenario | Tank | When it applies |
|---|---|---|
| Minimum viable | 55 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 75 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 125 gal | Best when keeping larger schools or reducing territorial pressure. |