I have one. Wanted one for a long time, And got one a couple of months ago from a fellow reefer. Unfortunately, it's in my 125g and is barely noticeable!
It's green and pink and about the size of a quarter. Poor little guy, when I remember he is there, I give him one mysis. Guess he's doing ok, he's was only dime size when I got him!! I've heard they will split like crazy! Hope this is true, but only time will tell??