Purple long tentacle anenome
 

After a long time of searching, I finally found a purple long tentacle anenome at a local LFS. However, it's been a week now and the anenome still wanders around in my tank. Is there anything I can do to help it settling down? I have purchased red BTA before and they seem to settle down and pick their spot pretty quickly (within a day or two). I have a couple RBTA in the tank right now and they are quite happy and healthy. Should I do a water change??