Sorry to drag this off topic but Olaf was pronounced dead when I got home from work yesterday (by herself).
I, however, then took a look at him whereupon his condition was upgraded to Alive but gravely ill.
As it appeared he had minutes to go I took the last course advised in some notes I downloaded and effectively diffibulated him by lifting him up off the bottom of the tank and holding him in the slip stream of the filter pump to oxegenate his blood.
He perked up considerably and continues to hang on in there. I did a 25% water change and added a dozen capfuls of a medicine I picked up (it's a 25L tank).
This morning his condition is critical but stable.
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