[Van down by the river]

I'd agree with DJ88 as I've already mentioned to teevee.
Exerpt from PM:

You will soon have a very large dull, blueish gray brown fish that will be a problem in a reef. I know Scott Michaels book says 9" but I can assure you this is incorrect. In addition to other authors stating a size of 15", I myself had one for about 8 years in a 400 gallon. It was easily 12"-13" and attained this size quickly. It would whip around that tank in less than a second and it's fecal waste would easily cause water quality issues in a reef.

I just reposted for general knowledge. I did him to be hardy, I don't think they are rare, I just think that the demand for them is low. Another factor is they are Atlantic species, and 90% of shipments are Indo Pacific in origin.