nem split

I recently upgraded from a 25 gallon to a 60 gallon. My RBTA took a trip through the powerhead a few days ago. Kind of looked like it was filleted. Seems to be recovering OK, but half of it has slithered through the slits of the isolation container. I can't tell for sure where the foot is or...

So I have this anemone tank and there's one of the nems that's just humongous compared to the rest, I'll include a photo. Do you think all these little nems are splitting off of the largest one? I also have a bunch of medium sized ones in there too. This one's got to be like 12 inch's across and...