A couple of comments on this from my experience and reading comments through the years. First, certain types of anemones are more likely than others to survive in captivity. To paraphrase another comment, there are three types of anemone- difficult, more difficult, and impossible.
In my own experience I have been able to keep BTA's healthy and growing once I had sufficient light (I have HO T5s). I currently have a GBTA and a RBTA that started as small bleached creatures and are now a good size with a good dark brown colour. With good stable, water quality, sufficient light, spot feeding and protection from powerheads anemones can live a long time. Captive bred anemones are easier to find nowadays and is a good place to start as suggested in an earlier comment.
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