I have mine in a 125g tank. The dragon goby is more of an open water swimmer. He's always out and about. My yellow watchman is always hiding. When I had him in a 30g, I always knew where he was and he'd always come out at feeding time, although not far from his hole. In the 125, I worry about him sometimes because I may go a week or two without seeing him at all. I have the tank FULL of live rock, so there's a ton of hiding places. I don't even see him at feeding times. I guess he and the shrimp get enough food though. Every time I see them, they are healthy and doing fine.