Hey thincat ~ welcome to the forum!
If we are talking about the same blue streak wrasse then yes, they are pretty well known for being picky eaters and hence, hard to keep. From what I've read and some of the people I have bumped into, I think that more people are starting to have better luck with getting them to eat prepared foods; including myself. Without getting into my own opinions on the subject, I'd say that there is still some ethical dilema with keeping them because they provide a vital function in the wild. Point being, if you haven't already, don't be shocked to find people who disagree with your keeping one.
It does sound like you are off to a good start though. I'd keep an eye on their eating habits and maybe try feeding some finely chopped beef heart preparation once in a while.

Looks like everyone was posting at the same time and as usual, I was the slowest. I guess great minds do think alike
