The Engineer Goby is also known as convict worm goby, Pacific Neon Goby, Convict Worm Blenny. Though it is named a Goby, but it is not really a goby fish and is only member of the family Pholidichthydae. It shows different body marks throughout its life and that makes it different from other species of fishes. The Engineer Goby has black with white horizontal stripe running from eye to tail in its early age, and as they grow it becomes vertical bands. It is very good at digging extensive tunnels under your rock work, therefore we suggest you to place the rocks on the bottom of the tank. The Engineer Goby is fairly disease resistant and may withstand sub-optimal water conditions. This fish might feed on ornamental shrimps and tiny fishes. The Engineer Goby feeds on bottom-dwelling invertebrates, and can be fed with varied diet including frozen preparations for carnivores. There is a distinctive feature that differentiates both the sexes. Females has a fuller abdomen and larger as compared to males. The Engineer Goby egg mass is described as whitish, adhesive and approximately 2 mm in diameter. It breeds successfully in captivity, and the spawning frequency range from 8 - 28 days. It can be kept in a tank with 15 gallon or larger aquarium with a thick sand bed where it may make burrows. The Engineer Goby needs peaceful tank mates and plenty of hiding places. It can do well with other tank mates and can be introduced in group or in pairs in any tank.