mine is still new, ive had my BTA since jan. Here is a part right out of Clownfishes by Joyce D wilkerson
"During 1994-1995, about 100 hobbyists who had experiencekeeping clownfish-hosting sea anemones filled out survey forms posted on CompuServe FishNet and the Internet. The restlts showed that 46% of the anemones kept by reporting hobbyists with less than two years of marine aquarium-keeping experienve were dead after an average of 3.5 months. Those hobbyists with two to five years experience did not have much greater success: 40% of their anemones died an average of 11.5 months after acquistion. Even amoung aquarists with more than 5 years' experiene, 27% of their anemones were dead afer an average of 14 months. Only 1 out of every 18 anemones in the survey had been in captivity for three years, and 1 in 36 reached five years in captivity. The conclusion is obvious: clownfish-hosting anemones are not "hardy
in captivity. These odds are sad news for hobbyists's wallets but sadder still for the anemones, because anemones should theoretically live long lives, just as unfortunate are the many generations of settling juvenile clownfishes that will not finda home in the wild because an anemone was removed from its natural habittat only to die in an unsuspecting hobbyist's aquarium. Still, we can hope that their requirements will become better understoon in the near future and that captive-propagated specimens will become widely availible."
So yes, anemones do have a very low survival rate in the wild. Here are some things i would make sure you have become getting one:
-you have MH lighting, or a lot of t5 or a heck of a lot of VHO
-your tank is at least 6-8 months old, a year being more suitable
-you do frequent water changes and your waterlevels ahve become stable and remain pristine.