there's somewhere between 35 and 40 rbtas in my tank, and the default for them is without a doubt 'not bubbled'. one thing i have noticed is that whenever one of them gets inspired to bubble, the tentacles of other anemones that come in contact with the bubbled nem....will bubble as well. not the whole nem, just those tentacles in immediate contact with other already bubbled tentacles.
i can't say if there's just a particular flow in that spot, a particular lighting situation, some sort of anemone chemical cooties, or whatever else may be causing it, just something i've noticed.
to round out the anecdote, i guess....they're under 1600w MH, 2x10k 400w, 2x20k 400w, and i haven't intentionally fed them for over a year. they showed the same behavior whether being regularly fed or not.