How long have you had the anemone in the tank? Could the other tank occupants be irritating it and interfering with it settling? Years ago I had a BTA in the tank with my H. magnifica and it just wouldn't thrive. I'm an advocate of species specific tanks, although I'm aware that it not always necessary. Is there any possibility you could remove the anemone into another, already established tank (e.g., a quarantine tank) and provide it with a live rock substrate and see if it settles?
Gary
Gary
