Twinspot Signal Goby

Twinspot Signal Goby

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Twinspot Signal Goby fish (Signigobius biocellatus) is a small, colorful, and peaceful saltwater fish that belongs to the Gobiidae family. They are also known as the Signal Goby, Two-Spot Goby or Crab-Eye Goby due to their distinct markings and behavior. Proper care is crucial to keep these fish healthy and happy in an aquarium setting.

Tank Size and Environment

Twinspot Signal Goby fish are small and only grow up to 2 inches in length. They require a tank size of at least 20 gallons with a sandy substrate and plenty of hiding places, such as caves or live rocks. They are known for burrowing in the sand and creating tunnels, so it's essential to provide them with enough space to do so. A well-established aquarium with live rock can help create a suitable environment that mimics their natural habitat.

These fish are generally peaceful and can be kept with other non-aggressive fish species. However, it's best to avoid keeping them with larger and aggressive fish that may bully them or compete for resources.


Twinspot Signal Goby fish are carnivorous and primarily feed on small crustaceans and worms. In a home aquarium, they can be fed a varied diet of live or frozen foods, such as brine shrimp, mysis shrimp, and bloodworms. It's important to avoid overfeeding as it can lead to poor water quality and health issues.

Behavior and Compatibility

Twinspot Signal Goby fish are generally peaceful and can be kept in pairs or small groups with other non-aggressive fish species. They are known for their unique behavior, where they form symbiotic relationships with pistol shrimp. The shrimp will maintain and clean the burrow, while the goby will keep watch for predators.

It's essential to provide plenty of hiding places and burrowing space, as these fish are burrowers by nature. They can become stressed if they do not have adequate space to dig and burrow. Therefore, it's crucial to avoid overcrowding the tank.

Health and Disease

Twinspot Signal Goby fish are generally hardy and not prone to diseases if provided with a suitable environment and a varied diet. However, they can be susceptible to common fish diseases, including bacterial, fungal, and parasitic infections.

It's essential to observe their behavior and look for any signs of illness, such as loss of appetite, lethargy, or abnormal swimming patterns. If any signs of illness are noticed, it's crucial to isolate the affected fish and treat them accordingly.


Twinspot Signal Goby fish are relatively easy to breed in a home aquarium. The male will create a burrow in the sand and attract a female by calling her with a distinctive clicking sound. Once the female enters the burrow, the male will fertilize the eggs, and she will lay them in the burrow. The male will then guard the eggs and fan them with his fins to keep them oxygenated until they hatch.

In conclusion, Twinspot Signal Goby fish are a beautiful and fascinating addition to any aquarium. They require a suitable environment, a varied diet, and proper care to thrive. Providing them with adequate hiding places and burrowing space and keeping the water quality in check can help keep them healthy and happy. Their unique behavior and symbiotic relationship with pistol shrimp make them an interesting and entertaining fish to observe, and their relatively easy breeding habits make them an excellent choice for breeders.