Compatibility Overview
Percula Clownfish and Watchman Goby can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 29-gallon tank is recommended to provide adequate territory and water volume for both species.
| Factor | Percula Clownfish | Watchman Goby | Verdict |
|---|---|---|---|
| Temperature | 75–82°F | 72–82°F | ✅ 75–82°F |
| pH Range | 8.0–8.5 | 8.0–8.3 | ⚠️ 8.0–8.3 (narrow) |
| Temperament | semi | semi | ⚠️ Monitor |
| Adult Size | 3.1 in | 1.2 in | ⚠️ 2.6× difference |
| Min. Group | 1+ | 1+ | See below |
| Min. Tank Size | 29 gallons (for both species) | — | |
✅ Compatibility Positives
⚠️ Caution Points
Species Profiles
Percula Clownfish — Aquarium species
The Percula Clownfish, also known as the False Percula, is a popular beginner fish due to its hardiness and striking coloration. These fish are best kept in a saltwater tank with a minimum size of 30 gallons and compatible tankmates. They are peaceful, non-aggressive and do well in groups with other compatible species. Regular water quality maintenance is es
→ Full Percula Clownfish care guide
Watchman Goby — Aquarium species
The Watchman Goby is a peaceful and colorful addition to the marine aquarium. It is known for its slender body and distinctive yellow and dark spot pattern. These gobies are often found in pairs or small groups and require a well-maintained saltwater tank with plenty of hiding spots. With proper care, they can thrive for several years.
Frequently Asked Questions
Can Percula Clownfish live with Watchman Goby?
Yes, in a well-planned setup. Percula Clownfish and Watchman Goby can generally share an aquarium with appropriate planning. Both species prefer overlapping temperature and pH ranges, and neither poses a major aggression risk to the other. A minimum 29-gallon tank is recommended to provide adequate territory and water volume for both species.
What tank size do I need for Percula Clownfish and Watchman Goby together?
A minimum of 29 gallons is recommended for keeping Percula Clownfish and Watchman Goby together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Percula Clownfish and Watchman Goby?
75–82°F
Is a Percula Clownfish aggressive toward a Watchman Goby?
Percula Clownfish is semi and Watchman Goby is semi. No major aggression issues are expected between these species.
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 | 100/100 |
| Temperament | 62/100 |
| Adult Size | 72/100 |
| Swim Zone | 92/100 |
| 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 | 29 gal | Only for the recommended minimum groups, mature filtration, and close monitoring. |
| Recommended community | 40 gal | Adds territory, swimming room, and a safer buffer for behavior. |
| Low-conflict setup | 55 gal | Best when keeping larger schools or reducing territorial pressure. |