also, is there anything on that side of the coral that the elegance touches when it's fully expanded? If those tentacles are being irritated, it might explain why just those ones are retracting.
The other thing I would closely look at is the interface where the flesh meets the skeleton. On my australian one that I showed you pictures of I discovered what turned out to be a female gall crab. It was irritating the bejesus out of coral. It looked like this:
