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.