So I recently purchased 3 different gobies. A yellow watchman, a diamond, and a fierfish. I thought my firefish may have gone carpet surfing since I hadn't seen him in a couple days, but then he popped out of the diamond gobies burrow! I guess they are "bubbies" now. kind of cute, but is it normal? I was just glad to see him, and my lid is fairy close, si it would have been hard, but not impossible. He still hides, but I know he is there in the burrow.