Fish ID please!

[conk12301]

Here's a video of the new fish I got for my FOWLR. The guy at the LFS said it's a goby - couldn't remember exactly what type, though. Right now it's about 5 inches long and loves to burrow under the live rock and stay theres for hours or days even.

http://www.youtube.com/watch?v=RbJpZD77vjA

Any idea what kind of goby this is?

[thegrun]

Grudgeon Golby?

[conk12301]

Grudgeon Golby?

Look pretty similar in shape... but the body of this guy is all grey/silver with just a tiny bit of blue in the head. Close enough maybe?

[Collinrb]

looks also similar to the pearly dartfish sans the coloration in the tail. sorry I couldn't be of any actual help