Hi - are you still having problems with your BTA (original post was back in July).

From your description, I would guess that your lighting is not intense enough (PCs or MHs are recommended for this anemone) given that most of its nutritian comes directly from the Zooxanthellae. Expulsion of the Zooxanthellae is also a good indicator of inadequate lighting.

The only other thing I can see is possibly the temperature is a little too high. BTAs do well up to about 80F, but the ideal is more in line with 78F - high temps will also cause Zooxanthellae expulsion.

Here's a link to some additional info you might find helpful: http://www.earlsreef.com/ReefProfiles/CoralProfile.aspx?ID=2269

Good luck!

-seabott
Bubble Tip Anemone Info