Common name: Convict Blenny

General Information

The Convict Blenny, also known as the Engineer Goby, is a fascinating species that often surprises aquarists with its unique appearance and behavior. Despite its name, the Convict Blenny is not a true blenny but belongs to the family Pholidichthyidae. Its scientific name is Pholidichthys leucotaenia. This species is known for its striking black and white striped juvenile stage, which gradually transforms into a more eel-like appearance as it matures.

In the aquarium trade, the Convict Blenny is appreciated for its intriguing burrowing behavior and its ability to contribute to the tank's ecosystem by aerating the substrate. Its distinctive juvenile coloration often draws comparisons to the convict cichlid, hence its common name.

Care

Convict Blennies require a well-established aquarium with plenty of live rock and a sandy substrate to accommodate their burrowing nature. They are best kept in tanks with a secure lid, as they are known to be escape artists. A tank size of at least 200 liters is recommended to provide ample space for their activities.

To mimic their natural habitat, the tank should include a variety of hiding spots and tunnels created with rocks and PVC pipes. These structures not only provide shelter but also help reduce stress and encourage natural behaviors.

Diet and Feeding

Convict Blennies are omnivores and have a varied diet in the wild, consisting of small invertebrates and organic matter found in the substrate. In captivity, they should be fed a mix of high-quality marine pellets, frozen foods like mysis shrimp and brine shrimp, and occasional live foods to keep them healthy and active.

Feeding should occur once or twice daily, offering portions that can be consumed within a few minutes. This helps maintain water quality and ensures the fish receive adequate nutrition.

Behavior and Compatibility

The Convict Blenny is generally peaceful and can be a suitable addition to community tanks. However, their burrowing behavior can disturb the substrate and unsettle corals or other tank inhabitants that reside on the bottom.

They are not known to be aggressive but may become territorial if their burrow is threatened. It is best to house them with other peaceful species that will not outcompete them for food or space.

Juveniles are often seen in large groups that swim together, mimicking the appearance of a school of catfish. This behavior is believed to be a form of predator deterrence.

Reproduction

Breeding Convict Blennies in captivity is rare, and there is limited information on their reproductive habits. In the wild, they are known to form monogamous pairs and lay eggs in burrows, which the male guards until they hatch.

Health and Common Issues

Convict Blennies can live up to 10 years with proper care. They are hardy but require stable water conditions and a clean environment to thrive. Regular monitoring for signs of stress or illness is essential.

Habitat

Native to the Indo-Pacific region, Convict Blennies are typically found in coastal reefs and lagoons. They prefer environments with plenty of hiding spots and soft substrates for burrowing.