Looks to me like a yellow watchman goby, not a blue spot jawfish (below).I have had him since June of last year. I would have thought a grouper would have grown quickly. He has grown maybe a half inch.
You know what, I felt so stupid saying it wasn't a Blue Spot Jawfish, but you are correct. It is a Yellow Watchman Goby.
Thanks for keeping it PG13 There's kids around..... I lingerie about.