I'm pretty sure this was all covered in your other thread about the bta. It really comes down to 3 things.
1- You got a bleached, stressed amemone to start with.
2- Large clownfish can get rough with it and stress it more.
3- Your tank is too new and not stable/mature enough to revive a less than ideal specimen.
I don't see anything you can do at this point besides regular pwc
's to keep your water parameters in line, and hope for the best...and get it out of the tank ASAP if you see it start to desintergate.