I am no expert, no where close, I did have a RBTA one time in my old tank. I think I learned something about them, I am not sure but here's what happened to me. I put my Anemone in the tank, he moved around a bit until he found his sweet spot and never strayed form that spot for the most part. he would move under his rock at lights out in the tank, when the lights came back on the next day, out he would come till the lights went out again, then back under his rock. Nothing changed for about a year, he grew fat and happy and even split twice for me. Then I noticed that when I stretched out my water changes from one week to two weeks my zoas would grow better, if I stretched that water change to 2 1/2 weeks they grew even better. The dirty the water got the better my zoas would do. The down side, the Anemone didn't like that one bit, he started traveling all around the tank and ended up going thru my power head
I think he was taking a road trip trying to find a better quality of water in the tank to sit up its new home. Do I know this for fact, naw, its just what I think. How is the quality of water in your tank, Nitrates and Phosphates, how often and how large of water changes are you doing in your tank.