I just got a diamond goby last week after having issues keeping my sand bed clean. Beware you will have marine snow for a long time. Its been a week and my tank looks like its covered in a fine layer of powder. I've heard after a few weeks it'll die down as the fine particulates in the sand get filtered out.
Oh yeah, and he already jumped into the back of the tank once. Took apart the whole tank thinking he got squished under a rock after burrowing, before taking apart my fuge.