IMO, he's just pushed this too fast for the good of his creatures...According to the posts here and over at the RAG, he started this tank back in March...5 months is way too new of a tank for any anemones, let alone any of the more difficult ones. The standard recommendation is NO anemones in a tank until it's at least 1 year old, to allow the tank to mature, and in the case of new hobbyists, to allow the hobbyist time to learn about the animals in his/her care, and how best to take care of a marine aquarium...
From the pictures he's posted on the RAG, I'm not sure about this one...
He lost a rose BTA , I think in this same tank, maybe last week (?)
There might be things we don't know about going on, but I just suspect it's new tank problems more than anything...
Too bad, this is/was a beautiful anemone...hopefully it will pull through...