I love diamond gobies but they don't love me! I was vucuuming the rug around the tank just now and saw my goby on the floor - thought it was dead at first but saw its tail move so I put it back in the tank. I have no idea how long it was out of the tank. I just purchased him last weekend and he started eating and sifting right away. I always like having a goby in my tank as I love to watch them sift and think they have great personalities but I haven't been able to keep them for years like my other fish. I have a covered tank but they seem to manage to find the small gap where the tubes go in and out of my tank and jump out or just disappear. I sure hope he makes it!! I'm glad I wasn't lazy this morning - I could have easily skipped vacuuming today!!