Magnificent Anemones will usually pick out a spot near the top of your reef structure and will stay put if they are happy there.Spectacular display! Great Job!
Regarding your Purple Magnificent Anemone, has it always been in that spot?
I previously had mine isolated on it's own tower and had planned for the same in the new display. But having seen yours smack dab in a forest of SPS makes me think I may not need to isolate it.
Thoughts?
Mine did go for a walk a few years ago during a lighting upgrade, but as soon as I was finished, I put him back in his spot and he stayed.