JM, do you have clowns with your anemone that may be feeding it?
(storing food in it?)
You have not had your anemone very long, it takes time for them to adjust to your tank.
OPPS, I see you have a maroon, how big is it compared to your anemone and does it every leave it?
They are notorious for harassing a BTA to near death, keeping it so that it stays closed from all of the rubbing against it.
Please post a picture of your anemone so that we can see what it looks like, and also let us know on your tank specs, lightsing, flow and that maroon