for what its worth jojo, i have 4 bar gobies that have been hiding out since i added them about 1 week ago. they DO ocassionaly sneak out to grab some food, but most of the time ... they just sit in thier little cave and wait for food to come to them. i would try to spot feed your Goby, (shoot some garlic soaked food into his cave. usually if they see it and are hungery, they WILL eat it.