The next Friday, I posted this photo of the same anemone, taken the 27th.
I noticed that the base of the column seemed to be spreading and had a gap in the centre. Now watch what has happened since:
The anemone is now attached to the glass wall. But it seems to be still holding onto the mussel. In the next photo, taken a few minutes later, the shape of the "footprint" has changed; it's moving along the glass. And you can see a second foot holding the mussel.
And now there are two.
This anemone, "Anemone 1-a" is halfway up the glass wall. The mussel has moved to the bottom, carrying "Anemone 1-b".
Anemone 1-b. September 4
Both are healthy and hungry. There is still a bit of a scar visible on the bases of the columns.
I didn't know they did that.