Black Phantom Tetra and Watchman Goby Compatibility Overview
Black Phantom Tetra and Watchman Goby 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: Black Phantom Tetra wants 5.0โ7.0 and Watchman Goby wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
| Factor | Black Phantom Tetra | Watchman Goby | Verdict |
|---|---|---|---|
| Temperature | 68โ82ยฐF | 72โ82ยฐF | โ 72โ82ยฐF |
| pH Range | 5.0โ7.0 | 8.1โ8.4 | โ No overlap |
| Temperament | peaceful | peaceful | โ Compatible |
| Adult Size | 1.4 in | 4.0 in | โ ๏ธ 2.9ร difference |
| Min. Group | 8+ | 1+ | See below |
| Min. Tank Size | 75 gallons (for both species) | โ | |
Compatibility Positives
Incompatibility Reasons
Species Profiles
Black Phantom Tetra โ Hyphessobrycon megalopterus
The Black Phantom Tetra is a popular freshwater fish known for its striking black and silver coloration. It is generally peaceful and can be kept in a community tank with other non-aggressive species. They require a well-maintained tank with a moderate water flow and a good cover of plants.
โ Full Black Phantom Tetra care guide
Watchman Goby โ Cryptocentrus cinctus
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 Black Phantom Tetra live with Watchman Goby?
Generally not recommended. Black Phantom Tetra and Watchman Goby 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: Black Phantom Tetra wants 5.0โ7.0 and Watchman Goby wants 8.1โ8.4. Review the behavior and water details before deciding whether to attempt the pairing.
What tank size do I need for Black Phantom Tetra and Watchman Goby together?
A minimum of 75 gallons is recommended for keeping Black Phantom Tetra and Watchman Goby together. A larger tank improves water stability and reduces territorial conflict.
What temperature suits both Black Phantom Tetra and Watchman Goby?
72โ82ยฐF โ inside Black Phantom Tetra's 68โ82ยฐF and Watchman Goby's 72โ82ยฐF.
Is a Black Phantom Tetra aggressive toward a Watchman Goby?
Black Phantom Tetra is peaceful and Watchman Goby is peaceful. No major aggression issues are expected between these species.
Related Compatibility Guides
Tank Size for Black Phantom Tetra and Watchman Goby
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. |