The Engineer Goby (Pholidichthys leucotaenia), also known as the Convict Goby, is a fascinating fish that looks like an eel and undergoes a striking color transformation as it matures. Here’s how to properly care for one:
Tank Size: 55+ gallons for juveniles, but ideally 75+ gallons for adults.
Substrate: Fine sand is preferred, as they love to dig and burrow.
Rockwork: Provide plenty of live rock and caves to mimic their natural habitat.
Lid: A tight-fitting lid is essential as they can be escape artists.
Temperature: 74-80°F (23-27°C)
pH: 8.1-8.4
Salinity: 1.023-1.026
Ammonia/Nitrite: 0 ppm
Nitrate: 10 ppm
Temperament: Peaceful and social; best kept in groups of two or more.
Tankmates: Works well with other peaceful to semi-aggressive fish (e.g., tangs, clownfish, wrasses). Avoid aggressive species that may bully or outcompete them for food.
Burrowing: They will rearrange the substrate, so be mindful of rock stability.
Carnivorous: Requires a protein-rich diet.
Frozen meaty foods (Mysis, brine shrimp, krill) Pellets & flakes for carnivores Small pieces of seafood (shrimp, squid, fish) Live blackworms or copepods as treats.
Juveniles vs. Adults: Juveniles have black bodies with white horizontal stripes, which transition into a more eel-like pattern as they mature.
Reef Safe?: Yes, they are reef safe but may disturb corals by burrowing.
Digging Behavior: They will create tunnels under rocks and sand, so ensure rockwork is secure to prevent collapses.
