Blue Spot Watchman Goby

Cryptocentrus pavoninoides

(1 Reviews)

Blue Spot Watchman Goby

Blue Spot Watchman Goby

Cryptocentrus pavoninoides

(1 Reviews)

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Care Facts

Care Level: Easy
Temperament: Peaceful
Diet: Carnivore
Reef Safe: Yes
Minimum Tank Size: 30 gallons
Max Size: 6 inches
The Blue Spotted Watchman Goby, Elacatinus puncticulatus, is one of the very few gobies that will change color from the juvenile to adult stage: the juvenile color has an orange head and blue spots and the adult color is olive drab and blue spots. They are very peaceful and can be housed with other peaceful fish in a reef tank setting, but may become territorial towards other blennies, gobies or dartfish in smaller tanks.

Gobies tend to stay mainly towards the bottom of the tank, burrowing and sifting through the sand. However, this goby is also a known jumper, so a tightly fitting lid is suggested. Diet should include a variety of frozen or live mysis shrimp and vitamin enriched brine shrimp 1-2 times daily. 

The Blue Spot Watchman Goby, scientifically known as Cryptocentrus pavoninoides, is a captivating addition to saltwater marine aquariums, prized for its unique characteristics and striking appearance. This educational and formal product description aims to provide comprehensive information on various aspects of keeping the Blue Spot Watchman Goby in captivity.


Originating from the Indo-Pacific region, the Blue Spot Watchman Goby is commonly found in shallow coastal areas with sandy substrates and rocky outcrops. They form symbiotic relationships in the wild with burrowing pistol shrimp, creating intricate burrows in the substrate.

Reef Safety:

The Blue Spot Watchman Goby is considered reef-safe, making it a suitable choice for reef aquariums. Their presence adds a dynamic element to the tank without threatening corals or other invertebrates.

Size and Lifespan:

These gobies typically reach a size of around 3 inches (7.6 cm) in captivity. With proper care, they can have a 3 to 5 years lifespan, making them a long-term commitment for hobbyists.

Diet in Captivity:

Blue Spot Watchman Gobies are omnivores, and their diet should include a variety of foods such as small crustaceans, frozen mysis shrimp, and high-quality pellet or flake foods suitable for carnivores. Providing a well-balanced diet contributes to their overall health and vibrant coloration.

Aquaculture and Availability:

Blue Spot Watchman Gobies are successfully aquacultured, contributing to their availability to hobbyists. This ensures a sustainable source and reduces the impact on wild populations.


These gobies exhibit a peaceful temperament, making them suitable for community tanks. However, caution should be exercised when selecting tank mates, especially with aggressive species. Compatibility is enhanced when housed with other peaceful fish and invertebrates.

Sexual Dimorphism:

Blue Spot Watchman Gobies do not display significant sexual dimorphism, making it challenging to distinguish between males and females visually without specific breeding behaviors.

Juvenile to Adult Coloration Changes:

As juveniles, Blue Spot Watchman Gobies often have a more subdued coloration, gradually developing the vibrant blue spots that characterize adults. This color transformation adds visual interest to the aquarium over time.

Tank Requirements:

Minimum Aquarium Size: A tank with a minimum capacity of 20 gallons is suitable for a single Blue Spot Watchman Goby. Larger tanks are recommended for multiple gobies.

Water Conditions:

  • pH: Maintaining a stable pH level between 8.1 and 8.4 is crucial.
  • Salinity: A specific gravity of 1.020 to 1.025 is ideal for these gobies.
  • Water Temperature: The recommended temperature range is 72 to 78 degrees Fahrenheit.
  • Water Flow: Moderate water flow, mimicking their natural habitat, is preferred.

Other Common Names:

The Blue Spot Watchman Goby may also be called the Blue Spotted Watchman Goby or the Peacock Goby in the aquarium trade.

Five Compatible Tank Mates:

Why Choose is a reputable source for acquiring the Blue Spot Watchman Goby. Their commitment to providing healthy, aquacultured specimens ensures that hobbyists receive quality marine life for their aquariums. Additionally, the extensive selection and expert guidance make a reliable choice for enthusiasts seeking a diverse range of marine species.

In conclusion, the Blue Spot Watchman Goby is a captivating and manageable addition to saltwater aquariums. Its reef-safe nature, compatibility with other species, and vibrant coloration make it popular among hobbyists. When sourced from a reputable provider like, enthusiasts can trust in the quality and sustainability of their marine acquisition.

Very good Blue Spot Watchman Goby for your tank. I have lost this species and don't know why. Purchased a new one which just arrived.

Reviewed by: Brian Dogith on Sept. 12, 2021

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