OK, I (a 'he' BTW ) will say first, that I dont recomend anyone getting a cleaner wrasse. They do have a dismal record in the hobby. One of thousands of species that can be on that same list.
Im not normally one to flame ( thanks to all for not flameing me for keeping this fish ) or tell people what to do or not to do, Most of the time, anyways. haha. I try to explain that what I say is from experience or trusted reserch and in a respectfull way. I try to keep my post short and to the point but not sure if I can here. I do try and will agin. So......
I consider myself lucky or really the wrasse itself is lucky because, yes, I have had it for over 4 years, nearly 5. Its been through 2 hurricans and 1 tank change since I got it.
I purchased it from a LFS and acclimated it the normal drip, ect. The one 180g I placed it in was newlly set up but was stocked from an estabished 120g reef I had upgraded into it. I was stocking it with more fish and mainly bought the wrasse as protection against parisite for the other livestock, expecting and hopeing to prevent parisites or ick, ect. I know this may not be the moral thing to do but im being honset. The tank had healthy fuge quicly becomeing established and the tank had, some would say over stocked with some what large type fish ( several tangs, anthias, angles, and butterflys ) that would allow the cleaner to clean them. Not all fish will allow a cleaner to do this.
The wrasse did not eat introduced foods for a long time but did constantly pester the other fish for a cleaning. The fish were happy to oblidge.
After a few months, this fish always seemed healthy to my suprise, started takeing, tasteing some of the introduced foods, mainly PrimeReef and frozen mysis shrimps ( the main staple for all my fish along with nori and pellets). Now it eats anything with gusto and gets right into the frenzy with the others at feeding time. It cruses and picks at the live rocks and I have even seen it chase down small pods and eat them.
Though none of the so called cleaner wrasse are hardy in captivity, the Bluestreak generally the only one that seem to have a chance from research.
They do eat parisites from fish but mailly the cleaning action you see them doing is eating slimecoat from the fish. It is though that they get a needed special chemical or vitamine from it and that helps keep them healthy.
My wrasse still pesters the fish as ever but has been eating all other foods, even nori I place in there for the tangs and angles. None of the other fish I have has ever tryed to hurt it except sometimes the Flame angle will chase it but the wrasse runs to the Sailfin and hides behind it because the Flame will not mess with the Tang, Funny thing to watch, and it seems to know to stay away from the clowns when they have eggs.
I most say that the wrasse has a nice apperance and personality and is always out front and active, It will clean my hand when in there too, Sure is not a shy species.
Again, Im not recomending anyone get one becuase as I said. I feel its been luck for us both but it sure is one of my favorite fish and my fishes favorite fish too.
Im not saying that I know the secrete becuase I dont think there is one, I dont know why mine survived.......
So, thats the story, sorry it was so long.