Blue BTAs exist? 
Alan, I don't think that article is suggesting that the anemone is healthy without zooxanthellae, simply that the zooxanthellae that are expelled continue to photosynthesize, which wouldn't help the anemone. If you were aware of this and I misconstrued your interest in the article, ignore me (maybe you are suggesting that expelled zooxanthellae are reabsorbed). 
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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