A drama of my own making: the nem hit a powerhead. I should have provided covers, I should have switched the powerheads off for the night... Gosh, so old, yet so stupid I am.
The nem looked like a goner when I detached it from the powerhead. There was a gaping hole in the centre, and the gastric cavity appeared to be gone. It looked like a sad doughnut. I put it on top of a rock and tried to wake myself up enough to start thinking properly - it was 4 am.
The nem about an hour after the accident:
I decided to put the nem into a glass dish and keep it in the tank, as I had no free hospital tank. In the meantime, however, the nem attached itself to that rock, so I decided to leave it where it was. I put the skimmer into turbo mode, maxed out the return pump and, of course, switched off the powerheads.
As I was sitting there looking at the mangled body, the nem started moving on its own, down and away from the top of the rock. It actively crawled down the rock and into a cave next to it. It attached itself to the roof of the cave and has stayed there ever since.
This is how it looked this morning, approximately 28 hours after the accident. It looks horribly mangled, but it is certainly alive. It has managed to inflate about 30% of its tentacles. The mouth is intact and partially open (not visible on the photo).
I don't know whether it has a chance. I can only hope. I was so stupid.