Just wanted to drag this thread back to the surface with an update. The anemone had started to move from one rock to another for the first time in about 3 years. He got almost all the way over and I finally had to pull him off of his old rock. I tore a small section of his base, and finally got a good picture of the healed/healing area. This scar is about an inch tall (Yes, the anemone really is that big. )
Anyway, I had hoped that the tear would initiate a split, but no such luck--it just seems to be healing back down to the rock. ::shrug:: at least he's happy and healthy!