Not a clue. He was in captivity for four months before I got him; he was eating, but I don't know if he was fed properly -- he'd gotten pretty thin and had the start of HLLE; maybe being malnourished affected him in some way I couldn't see, but he looked outwardly healthy to me. Once I got him home and settled, his eating just got better and better and he gained weight well. I had him for eight or nine months, he just got fatter and healthier looking every month. He was such a pet -- he begged for his breakfast every morning, never took any crap from the other fish but didn't dish any out either. He was the 'boss' of the tank, so I don't think he was beaten up. His behaviour, colouration and eating habits were completely normal this morning when I left the house. My husband said he heard a bang earlier that sounded like the eggcrate being hit, and expected to come into the living room and find our fairy wrasse on the floor again (he's a regular escape artist) but once he saw the wrasse swimming about he didn't think to check on the rest of the fish. I'm wondering if something spooked the angel and he got hurt, but I can only guess. By the time I saw him the crabs had started their work so examining him for cuts and bruises was pretty futile.
I did enjoy the time I had with him, he was a gorgeous fish full of personality. I'm glad I have a place to talk about this -- ever try explaining to a non-reefer why you're in tears over 'just a fish'? They just don't get it.