Anemones will blow up in an attempt to move, acclimate, and just because. from what you have described, it is not possible to render an honest opinion unless the animals condition, acclimation procedure at lfs and your home, water qualities, how long at lfs and what the other animals have done from this shipment. it is really a crap shoot sometimes, as the damage is sometimes done at time of collection/shipment and takes a month or better to show up. just sounds like too much stress and too many changes too quckly. the safe route is to return it and not take the chance, however, if you decide to see if it will acclimate, watch it carefully and do not force feed it, remove before it turns to jelly. good luck.