What do you mean? Gobys never leave the bottom. It kind of funny after I acclimated him because when I put him in the main tank, he just floated down to the bottom, made a burrow under a rock, and then peaks his head out and watches... hence the name Watchmen Goby. I have only had my Goby for almost 2 weeks, and he will verture out a little ways to get food. And if he doesnt, then when he is hungry enough, he will get out of his hole for food. But the current usually blows the food right to him. lol