Hi Meowzer,
I am sorry, I saw sleeper goby and went off into a memory lane. I tried to upload a picture but I can't get it to work. The one I was going on about was a golden headed sleeper goby, which I thought looked better than the diamond one.
I never heard of a sleeper banded bullet. I learned something new. I have a goldenheaded sleeper now.
In the end... sand sifting gobys are great fish, and they get along fine with a fire fish gobys.