Well, so far so good. He eats the cleaned prawns, gets closer when I splash them in the water, can almost drop them in is mouth. Not much though, after 5 large prawns he turned away.
He is also ok with patting him on the side and seems to be looking better from what I can see from his head.
Will try to make some pictures tomorrow to get a better view of his lips and head. See if the wounds are gone.
Changing water now, pumped out about 50% and running a gardenhose in the pond to top it up.
Will try some prawns again later this afternoon.