Pholidichthys leucotaenia

Convict Blenny/Goby (Pholidichthys leucotaenia)

Let’s take a closer look at a very special marine aquarium inhabitant, the Convict Blenny/Goby, also known as the Engineer Blenny/Goby. With its distinctive appearance and intriguing behaviors, this captivating fish species adds a unique charm to any saltwater setup. In this comprehensive guide, we’ll unravel the mysteries surrounding the Convict Blenny/Goby, from its size and appearance to its habitat, behavior, diet, and expert care tips for successful aquarium keeping.

Size and appearance

The Convict Blenny/Goby boasts an elongated body adorned with striking black and white stripes, reminiscent of a convict’s uniform. Growing to lengths of up to 20 centimeters (8 inches), this fish showcases a sleek, streamlined profile with large eyes and a prominent dorsal fin. Its unique coloration and pattern make it a standout addition to any marine aquarium.


Indigenous to the Indo-Pacific region, the Convict Blenny/Goby is commonly found in the shallow coastal waters of the Indian Ocean and the western Pacific Ocean. It inhabits coral reefs, rocky shores, and tidal pools, where it seeks shelter among crevices and caves.


Known for its inquisitive nature, the Convict Blenny/Goby is a highly active and engaging fish species. It spends much of its time exploring its surroundings, darting in and out of hiding spots, and engaging in social interactions with tank mates. Despite its small size, it can exhibit territorial behaviors, particularly towards other blennies or gobies.


As an omnivorous species, the Convict Blenny/Goby has a varied diet that includes both plant and animal matter. In the wild, it feeds on algae, small crustaceans, and planktonic organisms. In captivity, it readily accepts a diet of high-quality marine pellets, frozen foods such as brine shrimp and mysis shrimp, and algae-based supplements. Offering a balanced diet ensures the health and vitality of this fascinating fish.

How to keep the Clown Loach at home

To provide optimal care for Convict Blennies/Gobies in your aquarium, consider the following guidelines:

Tank size: Provide a well-established marine aquarium with plenty of hiding spots, such as rock formations, caves, and crevices. A minimum tank size of 100 liters (25 gallons) is recommended to accommodate the active nature of these fish.
Water parameters: Maintain stable water conditions with a temperature range of 24-26°C (75-79°F) and a pH level between 8.1 and 8.4. Regular water changes and efficient filtration are essential to ensure water quality and clarity.
Tank mates: Choose tank mates carefully, opting for peaceful species that share similar water parameters. Compatible tank mates include other small, non-aggressive fish species and invertebrates.
Compatibility: While generally peaceful, the Convict Blenny/Goby may exhibit territorial behavior towards other blennies or gobies. Ensure adequate space and hiding spots to minimize aggression within the aquarium.

With its captivating appearance and engaging behavior, the Convict Blenny/Goby offers marine aquarium enthusiasts a delightful glimpse into the diverse world of saltwater fishkeeping. By understanding its natural habitat and specific care requirements, you can create a thriving aquatic environment that showcases the beauty and charm of this fascinating fish species. Embrace the opportunity to care for Convict Blennies/Gobies, and you’ll be rewarded with endless hours of enjoyment and admiration for these captivating marine creatures.

Scientific namePholidichthys leucotaenia
Type of aquariumMarine
SizeUp to 20 cm (8 inches)
Ideal tank size100 liters (25 gallons) or more
Ideal water temperature24-26 °C (75-79 °F)
DietOmnivorous; algae, crustaceans, plankton
ReproductionNot common in captivity
Life spanVaries, typically 5-8 years
SchoolingSolitary, can be territorial


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