hello everyone

can someone help me,my wife bought me a blue cleaner wrasse yesterday....i put him in the tank, he looks like he's doing well cleaning other tangs,looking like he's having a good time..today i check the tank and cant find him...i look under a rock and there he is with some type of bubble around half his body...the only way i can describe it as a spider web or the beggining stage of some type of cocoon....now i did find him with half his body under the rock where my lobster lives..but i've never heard of a lobster doing this....needless to say he's just about gone...i doubt he last thru the day... :cry

i have no idea what this was around his body...btw when i moved him to a quaritine tank this bubble kind of came off...