My fish is missing! ??

[Massiso]

I just got a yellow coris wrasse and is no where to be found I have looked everywhere, I did some work on my canopy so I laid a towel ontop just in case anyone made a run for it but when I put everything back together the yellow wrasse went M.I.A I have been reading about them and they tend to go into the sand but its been over night and I don't see it anywhere can they just hide and die??? I hope not