A LFS in my area has had a pair now for ~1.5 years. They are in a tank that's about 120 gallons (weird deminsions) with a number of other fish ( flame wrasse pair, radiant wrasse, CBB, LNB, pair or dragonettes, pair of janns pipefish, chevron tang to name a few). These fish have huge bellies, and eat everything thrown in tank including mysis, live blackworms, pellets, etc.
They are very large (~4-5") and have no problem taking down big food items. The tank itself has no mechanical filtration at all, no sump, no skimmer, it does have a couple of vortech's and a lot of caulerpa growing in it though.
I have no personal experience with them, so obviously I don't know what to attribute their success to, (maybe the fact that there is no sump/skimmer to remove microfauna?), but figured the info might still be useful.
I'll snap a pic next time I'm over that way, but it's about 45 miles away, so who knows when that'll be.