Some BTA's just don't bubble. I've had tons, some bubble all the time, some bubble some of the time, and some just plain never do. There is a theory that it has to do with where they're collected, etc. I'm not sure if I fully believe that. I've tried different flow, different lighting and had the same effects, it's random. If color is good and you feel that you have enough lighting (would like to know what your lighting and other parameters are), it may just be the anemone. But again, lets rule out lighting, etc first.