Cleaner Wrasse??

[dacookster]

What's the deal with these poor guys??? I just got one from a local lfs, quite large actually, only to read up that they are horrible to keep in a reef and will not last long. Judging by the size of this guy, he's made it a long time in captivity. He's almost 5" long. Anyways, annihilates any type of food I put in the system. I feed my tank only once a day. After reading some articles and watching some youtube videos, I'm freaking out thinking I've sentenced him to death. Any thoughts??