I doubt you'll find too much out on the web for these guys. They're from the Atlantic, and Atlantic fish tend to be much less popular then Pacific (cost reasons). @ 7", this one is full size, it's unlikely it will grow any. He definitely will make a mess out of your sandbed, a 7" fish, diving in and out of the sand, will do that
. It's your 'basic' crustacean-hunting-fish, so make they get meaty foods, whole shrimp, scallops, clams, etc, rather then a mysis/brine diet. If you want more information on this guy, look for info on it's pseudo-cousin fish, the Dragon wrasse. Although the Dragon wrasse will get more the 15", and your Razor won't be too bad with the "rock moving" as the Dragon.
BTW, was there maybe an error on uploading the picture? It's still a thumbnail-size after you click it. Could you try uploading it again? I would definitely like to see a nice picture of it!