Tiger Sleeper Goby = Valencienna wardii
I have one now and he is a doll. He acclimates easily and doesn't bother anyone in the 55 gallon reef tank and he shares his space with an orange spotted blenny, two aurora gobies, possum wrasse, and melanurus wrasse.
He spends his day sifting sand and doesn't carry it up and scatter it like you describe. He does MOVE the sand around though, so you have to not mind him redecorating a little.