Wah... got a 'hospital tank'!! 
Do
you have medical staff fishes to tend to him too?
Could it be internal injuries? Did he eat something with a
tough shell that kinda pierced his stomach or something like
that? 
Actually I think he had internal and external injuries
Yeah I treated him with medicine for internal injuries as
well
He only eats deshelled prawns
Anyway he is back to black though still not completely stable
coz he still have a golden sheen
Nurse? That would be me >.<
